Add -C option to the manpage fd.1.

Author: sivaramsk

doc/fd.1

@@ -385,7 +385,7 @@ Examples:
   \-\-owner :students
   \-\-owner "!john:students"
 .TP
-.BI "\-\-base\-directory " path
+.BI "-C, \-\-base\-directory " path
 Change the current working directory of fd to the provided path. This means that search results will
 be shown with respect to the given base path. Note that relative paths which are passed to fd via the
 positional \fIpath\fR argument or the \fB\-\-search\-path\fR option will also be resolved relative to