Help: Revert "improve install() documentation of argument ordering"

Revert commit f09fda97d8 (Help: improve install() documentation of
argument ordering, 2018-01-08, v3.11.0-rc1~126^2).  Although the
example it added is correct, its explanation is misleading.
Revert it to make room for an alternative.

Issue: #25144
Issue: #16362

Help/command/install.rst

@@ -67,21 +67,7 @@ signatures that specify them.  The common options are:
 
 ``CONFIGURATIONS``
   Specify a list of build configurations for which the install rule
-  applies (Debug, Release, etc.). Note that the values specified for
-  this option only apply to options listed AFTER the ``CONFIGURATIONS``
-  option. For example, to set separate install paths for the Debug and
-  Release configurations, do the following:
-
-  .. code-block:: cmake
-
-    install(TARGETS target
-            CONFIGURATIONS Debug
-            RUNTIME DESTINATION Debug/bin)
-    install(TARGETS target
-            CONFIGURATIONS Release
-            RUNTIME DESTINATION Release/bin)
-
-  Note that ``CONFIGURATIONS`` appears BEFORE ``RUNTIME DESTINATION``.
+  applies (Debug, Release, etc.).
 
 ``COMPONENT``
   Specify an installation component name with which the install rule