process.c: [DOC] env values in spawn [ci skip]

* process.c (rb_f_spawn): [DOC] elaborate environment variable
  values.  [ruby-core:70456] [Bug #11463]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51641 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Aug 19 23:55:29 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* process.c (rb_f_spawn): [DOC] elaborate environment variable
+	  values.  [ruby-core:70456] [Bug #11463]
+
 Wed Aug 19 23:48:06 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/win32.c (winnt_lstat): check reparse point tags and treat

process.c

@@ -4017,7 +4017,7 @@ rb_f_system(int argc, VALUE *argv)
  *      name => val : set the environment variable
  *      name => nil : unset the environment variable
  *
- *      the keys must be strings.
+ *      the keys and the values except for +nil+ must be strings.
  *    command...:
  *      commandline                 : command line string which is passed to the standard shell
  *      cmdname, arg1, ...          : command name and one or more arguments (This form does not use the shell. See below for caveats.)