sh.1: Document exit status of the function return command

[tembun_bk.ru]

Summary

It's not obvious that if exitstatus is omitted, the exit status of the function is taken from the last executed command.

[tembun_bk.ru]

Rebase the patch.

[tembun_bk.ru]

Rebase the patch.

[jilles]

bin/sh/sh.1

1226–1228

"of the function" seems weird, since the previous sentence says return may also return from a sourced script or shell instance. Perhaps omitting it would suffice?

1229

Manual page style does not use contractions like "it's".

[tembun_bk.ru]

• Remove redundant 'of the function' part.
• Change "it's" -> "it is".

[jilles]

Let's not mention the behaviour when return exits the shell during an EXIT trap action, since it's obscure and probably incorrect (I think it's supposed to work like exit, with a difference between return by itself and return "$?", but in practice it always ignores the argument during an EXIT trap action).