* process.c: [DOC] typo fix by @jkassemi [fix GH-544][ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45148 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

process.c

@@ -3386,7 +3386,7 @@ rb_fork_ruby(int *status)
  *
  *  If fork is not usable, Process.respond_to?(:fork) returns false.
  *
- *  Note that fork(2) is not avaiable on some platforms like Windows and NetBSD 4.
+ *  Note that fork(2) is not available on some platforms like Windows and NetBSD 4.
  *  Therefore you should use spawn() instead of fork().
  */