Document brew link --force

Library/Contributions/manpages/brew.1.md

@@ -185,7 +185,7 @@ Note that these flags should only appear after a command.
     If `--git` is passed, Homebrew will create a Git repository, useful for
     creating patches to the software.
 
-  * `ln`, `link [--overwrite] [--dry-run]` <formula>:
+  * `ln`, `link [--overwrite] [--dry-run] [--force]` <formula>:
     Symlink all of <formula>'s installed files into the Homebrew prefix. This
     is done automatically when you install formula, but can be useful for DIY
     installations.
@@ -197,6 +197,8 @@ Note that these flags should only appear after a command.
     be linked or which would be deleted by `brew link --overwrite`, but will not
     actually link or delete any files.
 
+    If `--force` is passed, Homebrew will allow keg-only formulae to be linked.
+
   * `ls, list [--unbrewed] [--versions] [--pinned]` [<formulae>]:
     Without any arguments, list all installed formulae.
 

share/man/man1/brew.1

@@ -208,7 +208,7 @@ Download and patch \fIformula\fR, then open a shell\. This allows the user to ru
 If \fB\-\-git\fR is passed, Homebrew will create a Git repository, useful for creating patches to the software\.
 .
 .TP
-\fBln\fR, \fBlink [\-\-overwrite] [\-\-dry\-run]\fR \fIformula\fR
+\fBln\fR, \fBlink [\-\-overwrite] [\-\-dry\-run] [\-\-force]\fR \fIformula\fR
 Symlink all of \fIformula\fR\'s installed files into the Homebrew prefix\. This is done automatically when you install formula, but can be useful for DIY installations\.
 .
 .IP
@@ -217,6 +217,9 @@ If \fB\-\-overwrite\fR is passed, Homebrew will delete files which already exist
 .IP
 If \fB\-\-dry\-run\fR or \fB\-n\fR is passed, Homebrew will list all files which would be linked or which would be deleted by \fBbrew link \-\-overwrite\fR, but will not actually link or delete any files\.
 .
+.IP
+If \fB\-\-force\fR is passed, Homebrew will allow keg\-only formulae to be linked\.
+.
 .TP
 \fBls, list [\-\-unbrewed] [\-\-versions] [\-\-pinned]\fR [\fIformulae\fR]
 Without any arguments, list all installed formulae\.