QTemporaryDir: clarify path/filePath() API docs

QTemporaryDir(const QString &templatePath) API docs say the path is
relative or absolute depending on whether `templatePath` is relative or
absolute.

Pick-to: 6.7
Change-Id: If77f9b378158235a68344689ded6756ac3f083cc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 9dc189e632bd5b6921361af786cf54434d2adf45)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/corelib/io/qtemporarydir.cpp

@@ -239,6 +239,14 @@ QString QTemporaryDir::errorString() const
 /*!
    Returns the path to the temporary directory.
    Empty if the QTemporaryDir could not be created.
+
+//! [relative-or-absolute-path]
+   The returned path will be relative or absolulte depending on whether
+   QTemporaryDir was constructed with a relative or absolute path,
+   respectively.
+//! [relative-or-absolute-path]
+
+
 */
 QString QTemporaryDir::path() const
 {
@@ -253,6 +261,8 @@ QString QTemporaryDir::path() const
     Redundant multiple separators or "." and ".." directories in
     \a fileName are not removed (see QDir::cleanPath()). Absolute
     paths are not allowed.
+
+    \include qtemporarydir.cpp relative-or-absolute-path
 */
 QString QTemporaryDir::filePath(const QString &fileName) const
 {