Doc: Fix "Building with CMake and CTest" section in testlib overview

An earlier attempt to fix links created a superfluous link to the
section in the first sentence of the section. Fix the paragraph.

Pick-to: 6.8
Change-Id: If11803340659127429142d36d7669b9f91f7c2ee
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
(cherry picked from commit 218ad11)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

Author: jobor

src/testlib/doc/src/qttestlib-manual.qdoc

@@ -163,11 +163,12 @@
 
     \section2 Building with CMake and CTest
 
-    You can use \l {Building with CMake and CTest} to create a test.
-    \l{https://cmake.org/cmake/help/latest/manual/ctest.1.html}{CTest} enables
-    you to include or exclude tests based on a regular expression that is
-    matched against the test name. You can further apply the \c LABELS property
-    to a test and CTest can then include or exclude tests based on those labels.
+    You can use CMake and
+    \l{https://cmake.org/cmake/help/latest/manual/ctest.1.html}{CTest} to create
+    a test. CTest enables you to include or exclude tests based on a regular
+    expression that is matched against the test name. You can further apply the
+    \c LABELS property to a test and CTest can then include or exclude tests
+    based on those labels.
     All labeled targets will be run when \c {test} target is called on the
     command line.