Help: Add notes for topic 'ctest-capture-error'

Help/release/dev/ctest-capture-error.rst

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+ctest-capture-error
+-------------------
+
+* The :command:`ctest_configure`, :command:`ctest_build`,
+  :command:`ctest_test`, :command:`ctest_coverage`, and :command:`ctest_upload`
+  commands gained a new ``CAPTURE_CMAKE_ERROR`` option to capture any errors
+  that occur as the commands run into a variable and avoid affecting the return
+  code of the :manual:`ctest(1)` process.