Document $LOAD_PATH.resolve_feature_path in globals.rdoc

* RDoc does not seem to support documenting singleton object methods,
  and making $LOAD_PATH a class as a workaround is too weird.

doc/globals.rdoc

@@ -25,7 +25,10 @@ $$::   The process number of the Ruby running this script.
 $?::   The status of the last executed child process.  This value is
        thread-local.
 $LOAD_PATH::   Load path for scripts and binary modules by load or require.
-               Aliased to $: and $-I.
+               Aliased to $: and $-I. Has a singleton method
+               $LOAD_PATH.resolve_feature_path(feature) that returns
+               [:rb or :so, path], which resolves the feature to the path the
+               original Kernel#require method would load.
 $LOADED_FEATURES::   The array contains the module names loaded by require.
                      Aliased to $".
 $DEBUG::     The debug flag, which is set by the -d switch.  Enabling debug

load.c

@@ -945,14 +945,13 @@ load_ext(VALUE path)
     return (VALUE)dln_load(RSTRING_PTR(path));
 }
 
-/* Method is documented in vm.c */
-
 static int
 no_feature_p(const char *feature, const char *ext, int rb, int expanded, const char **fn)
 {
     return 0;
 }
 
+// Documented in doc/globals.rdoc
 VALUE
 rb_resolve_feature_path(VALUE klass, VALUE fname)
 {

vm.c

@@ -2937,18 +2937,6 @@ static VALUE usage_analysis_operand_stop(VALUE self);
 static VALUE usage_analysis_register_stop(VALUE self);
 #endif
 
-/*
- * Document-method: RubyVM::resolve_feature_path
- * call-seq:
- *   RubyVM.resolve_feature_path(feature) -> [:rb or :so, path]
- *
- * Identifies the file that will be loaded by "require(feature)".
- * This API is experimental and just for internal use.
- *
- *    RubyVM.resolve_feature_path("set")
- *      #=> [:rb, "/path/to/set.rb"]
- */
-
 void
 Init_VM(void)
 {