Doc: Fix saturation graphic for HSV color model

The text is correctly describing the gradient from gray to blue but the
picture shows white to blue.  Additionally including the SVG sources for
creating the pictures.

Change-Id: I608a239f4de9c2d3761196c44db024cc31ce441a
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

src/gui/doc/images/qcolor-saturation.svg

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   version="1.1"
+   id="svg2"
+   viewBox="0 0 186.82259 45.046909"
+   height="12.713239mm"
+   width="52.725487mm">
+  <defs
+     id="defs4">
+    <linearGradient
+       id="linearGradient3346">
+      <stop
+         id="stop3348"
+         offset="0"
+         style="stop-color:#808080;stop-opacity:1" />
+      <stop
+         id="stop3350"
+         offset="1"
+         style="stop-color:#0000ff;stop-opacity:1" />
+    </linearGradient>
+    <linearGradient
+       gradientTransform="translate(109.31384,222.16879)"
+       gradientUnits="userSpaceOnUse"
+       y2="16.118341"
+       x2="200.35715"
+       y1="16.118341"
+       x1="3.7246187"
+       id="linearGradient3352"
+       xlink:href="#linearGradient3346" />
+  </defs>
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     transform="translate(-109.31384,-222.16879)"
+     id="layer1">
+    <rect
+       y="225.7121"
+       x="112.85714"
+       height="25.221529"
+       width="179.73599"
+       id="rect3336"
+       style="opacity:1;fill:url(#linearGradient3352);fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.1;stroke-linecap:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <text
+       id="text3338"
+       y="263.53079"
+       x="113.03048"
+       style="font-style:normal;font-weight:normal;font-size:10px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       xml:space="preserve"><tspan
+         y="263.53079"
+         x="113.03048"
+         id="tspan3340">0</tspan></text>
+    <text
+       id="text3342"
+       y="263.53079"
+       x="271.76645"
+       style="font-style:normal;font-weight:normal;font-size:10px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       xml:space="preserve"><tspan
+         y="263.53079"
+         x="271.76645"
+         id="tspan3344">255</tspan></text>
+  </g>
+</svg>

src/gui/doc/images/qcolor-value.svg

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   width="52.725487mm"
+   height="12.713239mm"
+   viewBox="0 0 186.82259 45.046909"
+   id="svg2"
+   version="1.1">
+  <defs
+     id="defs4">
+    <linearGradient
+       id="linearGradient3346">
+      <stop
+         style="stop-color:#000000;stop-opacity:1"
+         offset="0"
+         id="stop3348" />
+      <stop
+         style="stop-color:#ffffff;stop-opacity:1"
+         offset="1"
+         id="stop3350" />
+    </linearGradient>
+    <linearGradient
+       xlink:href="#linearGradient3346"
+       id="linearGradient3352"
+       x1="3.7246187"
+       y1="16.118341"
+       x2="183.57143"
+       y2="15.761199"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="translate(109.31384,222.16879)" />
+  </defs>
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1"
+     transform="translate(-109.31384,-222.16879)">
+    <rect
+       style="opacity:1;fill:url(#linearGradient3352);fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.1;stroke-linecap:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+       id="rect3336"
+       width="179.73599"
+       height="25.221529"
+       x="112.85714"
+       y="225.7121" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:10px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="113.03048"
+       y="263.53079"
+       id="text3338"><tspan
+         id="tspan3340"
+         x="113.03048"
+         y="263.53079">0</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:10px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="271.76645"
+       y="263.53079"
+       id="text3342"><tspan
+         id="tspan3344"
+         x="271.76645"
+         y="263.53079">255</tspan></text>
+  </g>
+</svg>