Update docs to explain use of -g and --files to search for paths. (#285)

Update docs to explain use of -g and --files to search for paths.

Fixes #284

doc/rg.1

@@ -1,6 +1,6 @@
-.\" Automatically generated by Pandoc 1.18
+.\" Automatically generated by Pandoc 1.19.1
 .\"
-.TH "rg" "1"
+.TH "" "" "" "" ""
 .hy
 .SH NAME
 .PP
@@ -69,6 +69,14 @@ Multiple glob flags may be used.
 Globbing rules match .gitignore globs.
 Precede a glob with a \[aq]!\[aq] to exclude it.
 .RS
+.PP
+Values given to \-g must be quoted or your shell will expand them and
+result in unexpected behavior.
+.PP
+Combine with the \-\-files flag to return matched filenames (i.e., to
+replicate ack/ag\[aq]s \-g flag).
+.PP
+For example: rg \-g \[aq]<glob>\[aq] \-\-files
 .RE
 .TP
 .B \-h, \-\-help
@@ -202,6 +210,10 @@ counted as part of the pattern.
 .B \-\-files
 Print each file that would be searched (but don\[aq]t search).
 .RS
+.PP
+Combine with the \-g flag to return matched paths, for example:
+.PP
+rg \-g \[aq]<glob>\[aq] \-\-files
 .RE
 .TP
 .B \-l, \-\-files\-with\-matches