BasicConfigVersion: Make docs refer to the macro, not the module name

The -ExactVersion variant already refers to the macro, and I think
it makes more sense anyway.

Modules/BasicConfigVersion-AnyNewerVersion.cmake.in

@@ -1,5 +1,5 @@
 # This is a basic version file for the Config-mode of find_package().
-# It is used by WriteBasicConfigVersionFile.cmake as input file for configure_file()
+# It is used by write_basic_package_version_file() as input file for configure_file()
 # to create a version-file which can be installed along a config.cmake file.
 #
 # The created file sets PACKAGE_VERSION_EXACT if the current version string and

Modules/BasicConfigVersion-SameMajorVersion.cmake.in

@@ -1,5 +1,5 @@
 # This is a basic version file for the Config-mode of find_package().
-# It is used by WriteBasicConfigVersionFile.cmake as input file for configure_file()
+# It is used by write_basic_package_version_file() as input file for configure_file()
 # to create a version-file which can be installed along a config.cmake file.
 #
 # The created file sets PACKAGE_VERSION_EXACT if the current version string and