Fix CMAKE_(C|CXX|Fortran)_RELEASE helpstrings (#14606)

Remove the platform-specific description from the cache entry help
strings for these variables.

Modules/CMakeCInformation.cmake

@@ -121,7 +121,7 @@ if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
   set (CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL_INIT}" CACHE STRING
     "Flags used by the compiler during release minsize builds.")
   set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE_INIT}" CACHE STRING
-    "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
+    "Flags used by the compiler during release builds.")
   set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
     "Flags used by the compiler during Release with Debug Info builds.")
 endif()

Modules/CMakeCXXInformation.cmake

@@ -211,7 +211,7 @@ if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
   set (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL_INIT}" CACHE STRING
       "Flags used by the compiler during release minsize builds.")
   set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE_INIT}" CACHE STRING
-     "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
+     "Flags used by the compiler during release builds.")
   set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
      "Flags used by the compiler during Release with Debug Info builds.")
 

Modules/CMakeFortranInformation.cmake

@@ -228,7 +228,7 @@ if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
   set (CMAKE_Fortran_FLAGS_MINSIZEREL "${CMAKE_Fortran_FLAGS_MINSIZEREL_INIT}" CACHE STRING
       "Flags used by the compiler during release minsize builds.")
   set (CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE_INIT}" CACHE STRING
-     "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
+     "Flags used by the compiler during release builds.")
   set (CMAKE_Fortran_FLAGS_RELWITHDEBINFO "${CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
      "Flags used by the compiler during Release with Debug Info builds.")