Fix non-recursive gitignore files patterns ("/foo")

Author: Thannoy

book/02-git-basics/sections/recording-changes.asc

@@ -205,6 +205,7 @@ The rules for the patterns you can put in the `.gitignore` file are as follows:
 
 *  Blank lines or lines starting with `#` are ignored.
 *  Standard glob patterns work.
+*  You can start patterns with a forward slash (`/`) to avoid recursivity.
 *  You can end patterns with a forward slash (`/`) to specify a directory.
 *  You can negate a pattern by starting it with an exclamation point (`!`).
 
@@ -222,7 +223,7 @@ Here is another example .gitignore file:
 # but do track lib.a, even though you're ignoring .a files above
 !lib.a
 
-# only ignore the root TODO file, not subdir/TODO
+# only ignore the TODO file in the current directory, not subdir/TODO
 /TODO
 
 # ignore all files in the build/ directory