[DOC] Use rdoc-ref

Author: nobu

doc/language/option_dump.md

@@ -1,7 +1,7 @@
 # Option `--dump`
 
 For other argument values,
-see {Option --dump}[options_md.html#label--dump-3A+Dump+Items].
+see {Option `--dump`}[rdoc-ref:options.md@--dump+Dump+Items].
 
 For the examples here, we use this program:
 

doc/language/options.md

@@ -650,7 +650,7 @@ option was given:
   Same as [option `--version`][--version].
 
 For other argument values and examples,
-see {Option --dump}[option_dump_md.html].
+see {Option `--dump`}[rdoc-ref:option_dump.md].
 
 ### `--enable`: Enable Features