Docs: uppercase spelling of utf-8

It should be spelled UTF-8 (official name by the Unicode Consortium).

Change-Id: Ib358d0870e77f0cb4cdb920ed5ca829f100707a1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 0770171dcda24a567d6f57b87fdd284011e56e16)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit dbd149375b016ec51432f036977e312df9dc58a7)

src/corelib/io/qsettings.cpp

@@ -2473,11 +2473,11 @@ void QConfFileSettingsPrivate::ensureSectionParsed(QConfFile *confFile,
         "%General" section, \e not in the "General" section.
 
     \li In line with most implementations today, QSettings will assume that
-        \e values in the INI file are utf-8 encoded. This means that \e values
-        will be decoded as utf-8 encoded entries and written back as utf-8.
+        \e values in the INI file are UTF-8 encoded. This means that \e values
+        will be decoded as UTF-8 encoded entries and written back as UTF-8.
         To retain backward compatibility with older Qt versions, \e keys in the
         INI file are written in %-encoded format, but can be read in both
-        %-encoded and utf-8 formats.
+        %-encoded and UTF-8 formats.
 
     \endlist
 
@@ -2488,7 +2488,7 @@ void QConfFileSettingsPrivate::ensureSectionParsed(QConfFile *confFile,
     however fully readable by a Qt 6 based application (unless a ini codec
     different from utf8 had been set). But INI files written with Qt 6
     will only be readable by older Qt versions if you set the "iniCodec" to
-    a utf-8 textcodec.
+    a UTF-8 textcodec.
 
     \sa registerFormat(), setPath()
 */

src/corelib/text/qbytearray.cpp

@@ -835,7 +835,7 @@ QByteArray qUncompress(const uchar* data, qsizetype nbytes)
     \endcompareswith
     \compareswith strong QChar char16_t QString QStringView QLatin1StringView \
                   QUtf8StringView
-    When comparing with string types, the content is interpreted as utf-8.
+    When comparing with string types, the content is interpreted as UTF-8.
     \endcompareswith
 
     QByteArray can be used to store both raw bytes (including '\\0's)

src/corelib/text/qchar.cpp

@@ -59,7 +59,7 @@ QT_BEGIN_NAMESPACE
     \compareswith strong char16_t QString QStringView QLatin1StringView QUtf8StringView
     \endcompareswith
     \compareswith strong {const char *} QByteArray QByteArrayView
-    The contents of the byte array is interpreted as utf-8.
+    The contents of the byte array is interpreted as UTF-8.
     \endcompareswith
 
     In Qt, Unicode characters are 16-bit entities without any markup

src/corelib/text/qlatin1stringview.qdoc

@@ -16,7 +16,7 @@
                   {const char16_t *}
     \endcompareswith
     \compareswith strong {const char *} QByteArray QByteArrayView
-    The byte array data is interpreted as utf-8.
+    The byte array data is interpreted as UTF-8.
     \endcompareswith
 
     Many of QString's member functions are overloaded to accept

src/corelib/text/qstring.cpp

@@ -1717,7 +1717,7 @@ void qtWarnAboutInvalidRegularExpression(const QString &pattern, const char *whe
                   QStringView QUtf8StringView
     \endcompareswith
     \compareswith strong QByteArray QByteArrayView {const char *}
-    When comparing with byte arrays, their content is interpreted as utf-8.
+    When comparing with byte arrays, their content is interpreted as UTF-8.
     \endcompareswith
 
     QString stores a string of 16-bit \l{QChar}s, where each QChar

src/corelib/text/qutf8stringview.qdoc

@@ -16,7 +16,7 @@
                   QLatin1StringView
     \endcompareswith
     \compareswith strong {const char *} QByteArray QByteArrayView
-    The contents of byte arrays is interpreted as utf-8.
+    The contents of byte arrays is interpreted as UTF-8.
     \endcompareswith
 
     A QUtf8StringView references a contiguous portion of a UTF-8