manpage: improve synopsis for 'options' command

The options `--all`, `--installed`, and a list of formulae are mutually
exclusive arguments, of which exactly one is required.

Library/Homebrew/manpages/brew.1.md

@@ -315,8 +315,8 @@ With `--verbose` or `-v`, many commands print extra debugging information. Note
     If `--force` is passed, then treat installed <formulae> and passed <formulae>
     like if they are from same taps and migrate them anyway.
 
-  * `options` [`--compact`] [`--all`] [`--installed`] <formula>:
-    Display install options specific to <formula>.
+  * `options` [`--compact`] (`--all`|`--installed`|<formulae>):
+    Display install options specific to <formulae>.
 
     If `--compact` is passed, show all options on a single line separated by
     spaces.

share/doc/homebrew/brew.1.html

@@ -249,7 +249,7 @@ packages.</p>
 
 <p>If <code>--force</code> is passed, then treat installed <var>formulae</var> and passed <var>formulae</var>
 like if they are from same taps and migrate them anyway.</p></dd>
-<dt><code>options</code> [<code>--compact</code>] [<code>--all</code>] [<code>--installed</code>] <var>formula</var></dt><dd><p>Display install options specific to <var>formula</var>.</p>
+<dt><code>options</code> [<code>--compact</code>] (<code>--all</code>|<code>--installed</code>|<var>formulae</var>)</dt><dd><p>Display install options specific to <var>formulae</var>.</p>
 
 <p>If <code>--compact</code> is passed, show all options on a single line separated by
 spaces.</p>

share/man/man1/brew.1

 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "BREW" "1" "December 2015" "Homebrew" "brew"
+.TH "BREW" "1" "January 2016" "Homebrew" "brew"
 .
 .SH "NAME"
 \fBbrew\fR \- The missing package manager for OS X
@@ -334,8 +334,8 @@ Migrate renamed packages to new name, where \fIformulae\fR are old names of pack
 If \fB\-\-force\fR is passed, then treat installed \fIformulae\fR and passed \fIformulae\fR like if they are from same taps and migrate them anyway\.
 .
 .TP
-\fBoptions\fR [\fB\-\-compact\fR] [\fB\-\-all\fR] [\fB\-\-installed\fR] \fIformula\fR
-Display install options specific to \fIformula\fR\.
+\fBoptions\fR [\fB\-\-compact\fR] (\fB\-\-all\fR|\fB\-\-installed\fR|\fIformulae\fR)
+Display install options specific to \fIformulae\fR\.
 .
 .IP
 If \fB\-\-compact\fR is passed, show all options on a single line separated by spaces\.