Q{Any,Utf8,}StringView: fix docs of generic Container ctor

For QAnyStringView, the docs were missing completely.

For QUtf8StringView and QStringView, they weren't updated following
the rewrite of the std::basic_string ctors into generic Container
ones.

Amends 9e1dc1e8a9 and
2c9529e158.

Pick-to: 6.5 6.2
Task-number: QTBUG-112746
Change-Id: I6eef2294db01e35f1a085df7fc76c25c6003530d
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qanystringview.qdoc

@@ -214,6 +214,23 @@
     The string view will be null if and only if \c{str.isNull()}.
 */
 
+/*!
+    \fn template <typename Container, if_compatible_container<Container>> QAnyStringView::QAnyStringView(const Container &str)
+
+    Constructs a string view on \a str. The length is taken from \c{std::size(str)}.
+
+    \c{std::data(str)} must remain valid for the lifetime of this string view object.
+
+    This constructor only participates in overload resolution if \c Container is a
+    container with a compatible character type as \c{value_type}.
+
+    The string view will be empty if and only if \c{std::size(str) == 0}. It is unspecified
+    whether this constructor can result in a null string view (\c{std::data(str)} would
+    have to return \nullptr for this).
+
+    \sa isNull(), isEmpty()
+*/
+
 /*!
     \fn template <typename Char, size_t Size> static QAnyStringView fromArray(const Char (&string)[Size]) noexcept
 

src/corelib/text/qstringview.cpp

@@ -264,17 +264,17 @@ QT_BEGIN_NAMESPACE
 /*!
     \fn template <typename Container, if_compatible_container<Container>> QStringView::QStringView(const Container &str)
 
-    Constructs a string view on \a str. The length is taken from \c{str.size()}.
+    Constructs a string view on \a str. The length is taken from \c{std::size(str)}.
 
-    \c{str.data()} must remain valid for the lifetime of this string view object.
+    \c{std::data(str)} must remain valid for the lifetime of this string view object.
 
-    This constructor only participates in overload resolution if \c StdBasicString is an
-    instantiation of \c std::basic_string with a compatible character type. The
+    This constructor only participates in overload resolution if \c Container is a
+    container with a compatible character type as \c{value_type}. The
     compatible character types are: \c QChar, \c ushort, \c char16_t and
     (on platforms, such as Windows, where it is a 16-bit type) \c wchar_t.
 
-    The string view will be empty if and only if \c{str.empty()}. It is unspecified
-    whether this constructor can result in a null string view (\c{str.data()} would
+    The string view will be empty if and only if \c{std::size(str) == 0}. It is unspecified
+    whether this constructor can result in a null string view (\c{std::data(str)} would
     have to return \nullptr for this).
 
     \sa isNull(), isEmpty()

src/corelib/text/qutf8stringview.qdoc

@@ -289,17 +289,17 @@
 /*!
     \fn template <typename Container, if_compatible_container<Container>> QUtf8StringView::QUtf8StringView(const Container &str)
 
-    Constructs a string view on \a str. The length is taken from \c{str.size()}.
+    Constructs a string view on \a str. The length is taken from \c{std::size(str)}.
 
-    \c{str.data()} must remain valid for the lifetime of this string view object.
+    \c{std::data(str)} must remain valid for the lifetime of this string view object.
 
-    This constructor only participates in overload resolution if \c Container is an
-    instantiation of \c std::basic_string with a compatible character type. The
+    This constructor only participates in overload resolution if \c Container is a
+    container with a compatible character type as \c{value_type}. The
     compatible character types are: \c char8_t, \c char, \c{signed char} and
     \c{unsigned char}.
 
-    The string view will be empty if and only if \c{str.empty()}. It is unspecified
-    whether this constructor can result in a null string view (\c{str.data()} would
+    The string view will be empty if and only if \c{std::size(str) == 0}. It is unspecified
+    whether this constructor can result in a null string view (\c{std::data(str)} would
     have to return \nullptr for this).
 
     \sa isNull(), isEmpty()