Help: Format visibility property and variable documentation

Add reStructuredText markup appropriately.

Help/prop_tgt/LANG_VISIBILITY_PRESET.rst

@@ -3,8 +3,9 @@
 
 Value for symbol visibility compile flags
 
-The <LANG>_VISIBILITY_PRESET property determines the value passed in a
-visibility related compile option, such as -fvisibility= for <LANG>.
+The ``<LANG>_VISIBILITY_PRESET`` property determines the value passed in a
+visibility related compile option, such as ``-fvisibility=`` for ``<LANG>``.
 This property only has an affect for libraries and executables with
-exports.  This property is initialized by the value of the variable
-CMAKE_<LANG>_VISIBILITY_PRESET if it is set when a target is created.
+exports.  This property is initialized by the value of the
+:variable:`CMAKE_<LANG>_VISIBILITY_PRESET` variable if it is set when a
+target is created.

Help/prop_tgt/VISIBILITY_INLINES_HIDDEN.rst

@@ -3,9 +3,9 @@ VISIBILITY_INLINES_HIDDEN
 
 Whether to add a compile flag to hide symbols of inline functions
 
-The VISIBILITY_INLINES_HIDDEN property determines whether a flag for
-hiding symbols for inline functions, such as -fvisibility-inlines-hidden,
+The ``VISIBILITY_INLINES_HIDDEN`` property determines whether a flag for
+hiding symbols for inline functions, such as ``-fvisibility-inlines-hidden``,
 should be used when invoking the compiler.  This property only has an affect
 for libraries and executables with exports.  This property is initialized by
-the value of the :variable:`CMAKE_VISIBILITY_INLINES_HIDDEN` if it is set
-when a target is created.
+the value of the :variable:`CMAKE_VISIBILITY_INLINES_HIDDEN` variable if it
+is set when a target is created.

Help/variable/CMAKE_LANG_VISIBILITY_PRESET.rst

@@ -1,8 +1,5 @@
 CMAKE_<LANG>_VISIBILITY_PRESET
 ------------------------------
 
-Default value for <LANG>_VISIBILITY_PRESET of targets.
-
-This variable is used to initialize the <LANG>_VISIBILITY_PRESET
-property on all the targets.  See that target property for additional
-information.
+Default value for the :prop_tgt:`<LANG>_VISIBILITY_PRESET` target
+property when a target is created.

Help/variable/CMAKE_VISIBILITY_INLINES_HIDDEN.rst

@@ -1,8 +1,5 @@
 CMAKE_VISIBILITY_INLINES_HIDDEN
 -------------------------------
 
-Default value for VISIBILITY_INLINES_HIDDEN of targets.
-
-This variable is used to initialize the VISIBILITY_INLINES_HIDDEN
-property on all the targets.  See that target property for additional
-information.
+Default value for the :prop_tgt:`VISIBILITY_INLINES_HIDDEN` target
+property when a target is created.