[DOC] Fix typos in comments

Author: etiennebarrie

include/ruby/internal/core/robject.h

@@ -55,7 +55,7 @@
  */
 enum ruby_robject_flags {
     /**
-     * This flag has marks that the object's instance variables are stored in an
+     * This flag marks that the object's instance variables are stored in an
      * external heap buffer.
      * Normally, instance variable references are stored inside the object slot,
      * but if it overflow, Ruby may have to allocate a separate buffer and spills

pathname_builtin.rb

@@ -321,7 +321,7 @@ def sub_ext(repl)
   end
 
   if File.dirname('A:') == 'A:.' # DOSish drive letter
-    # Regexp that matches an absoltute path.
+    # Regexp that matches an absolute path.
     ABSOLUTE_PATH = /\A(?:[A-Za-z]:|#{SEPARATOR_PAT})/
   else
     ABSOLUTE_PATH = /\A#{SEPARATOR_PAT}/