Fixup QTextOption enum formatting

Add missing trailing space, and change to newer "since Qt version"
format for relevant enum values.

Pick-to: 6.7 6.5
Change-Id: Iffe959545d9d608a65c41c8d3ad56f16468cfa73
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
(cherry picked from commit f7d1d5cb0110552c276ff7a4d8bfb79bf1129c87)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/text/qtextoption.cpp

@@ -267,8 +267,7 @@ QList<QTextOption::Tab> QTextOption::tabs() const
   \value ShowTabsAndSpaces Visualize spaces with little dots, and tabs with little arrows. Non-breaking spaces are
             shown differently to breaking spaces.
   \value ShowLineAndParagraphSeparators Visualize line and paragraph separators with appropriate symbol characters.
-  \value ShowDocumentTerminator Visualize the end of the document with a section sign. This enum value was added
-            in Qt 5.7.
+  \value [since 5.7] ShowDocumentTerminator Visualize the end of the document with a section sign.
   \value AddSpaceForLineAndParagraphSeparators While determining the line-break positions take into account the
             space added for drawing a separator character.
   \value SuppressColors Suppress all color changes in the character formats (except the main selection).

src/gui/text/qtextoption.h

@@ -62,7 +62,7 @@ public:
         WordWrap,
         ManualWrap,
         WrapAnywhere,
-        WrapAtWordBoundaryOrAnywhere
+        WrapAtWordBoundaryOrAnywhere,
     };
     inline void setWrapMode(WrapMode wrap) { wordWrap = wrap; }
     inline WrapMode wrapMode() const { return static_cast<WrapMode>(wordWrap); }
@@ -73,7 +73,7 @@ public:
         AddSpaceForLineAndParagraphSeparators = 0x4,
         SuppressColors = 0x8,
         ShowDocumentTerminator = 0x10,
-        IncludeTrailingSpaces = 0x80000000
+        IncludeTrailingSpaces = 0x80000000,
     };
     Q_DECLARE_FLAGS(Flags, Flag)
     inline void setFlags(Flags flags);