QString: update documentation

The QString documentation is aligned with QList regarding common
wording and ideas:
- Extend general class description
- Revise description of several methods
- Fix examples to use qsizetype instead of int
- Wrap descriptions at 80 characters

Pick-to: 6.0
Task-number: QTBUG-87962
Change-Id: I7d5a7e829ce8b98a0a1a7fae6b7ae0dec4effbae
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/corelib/doc/snippets/qstring/main.cpp b/src/corelib/doc/snippets/qstring/main.cpp
index 8abe69ed42..d0a1b9c9ba 100644
--- a/src/corelib/doc/snippets/qstring/main.cpp
+++ b/src/corelib/doc/snippets/qstring/main.cpp
@@ -393,7 +393,7 @@ void Widget::fromRawDataFunction()
     static const QChar unicode[] = {
             0x005A, 0x007F, 0x00A4, 0x0060,
             0x1009, 0x0020, 0x0020};
-    int size = sizeof(unicode) / sizeof(QChar);
+    qsizetype size = sizeof(unicode) / sizeof(QChar);
 
     QString str = QString::fromRawData(unicode, size);
     if (str.contains(pattern) {
@@ -586,7 +586,7 @@ void Widget::reserveFunction()
 {
     //! [44]
     QString result;
-    int maxSize;
+    qsizetype maxSize;
     bool condition;
     QChar nextChar;
 
@@ -700,7 +700,7 @@ void Widget::sizeFunction()
 {
     //! [58]
     QString str = "World";
-    int n = str.size();         // n == 5
+    qsizetype n = str.size();   // n == 5
     str.data()[0];              // returns 'W'
     str.data()[4];              // returns 'd'
     //! [58]