[PATCH v2] gitignore.txt: suggestions how to get literal # or ! at the beginning

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

We support backslash escape, but we hide the details behind the phrase
"a shell glob suitable for consumption by fnmatch(3)". So it may not
be obvious how one can get literal # or ! at the beginning of pattern.
Add a few lines on how to work around the magic characters.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 On Sat, Oct 6, 2012 at 8:21 PM, Jeff King <peff@peff.net> wrote:
 > It works fine for me with asciidoc 8.6.7. <sigh>

 8.6.5 works. I don't care deeply as I read .txt anyway. Here it goes
 again with examples.

 Documentation/gitignore.txt | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/gitignore.txt b/Documentation/gitignore.txt
index 96639e0..0bcf079 100644
--- a/Documentation/gitignore.txt
+++ b/Documentation/gitignore.txt
@@ -73,12 +73,16 @@ PATTERN FORMAT
  - A blank line matches no files, so it can serve as a separator
    for readability.
 
- - A line starting with # serves as a comment.
+ - A line starting with "`#`" serves as a comment.
+   Use "`\#`" instead for patterns that begin with "`#`",
+   for example, "`\#backup#.txt`".
 
- - An optional prefix '!' which negates the pattern; any
+ - An optional prefix "`!`" which negates the pattern; any
    matching file excluded by a previous pattern will become
    included again.  If a negated pattern matches, this will
    override lower precedence patterns sources.
+   Use "`\!`" instead for patterns that begin with "`!`",
+   for example, "`\!important!.txt`".
 
  - If the pattern ends with a slash, it is removed for the
    purpose of the following description, but it would only find
-- 
1.7.12.1.406.g6ab07c4