Update 4th code listing explanation

The program prints the results if the protocol, host, and username
match.

Signed-off-by: Bagas Sanjaya <[email protected]>

Author: bagasme

book/07-git-tools/sections/credentials.asc

@@ -174,7 +174,7 @@ include::../git-credential-read-only[]
 <3> This loop reads from stdin until the first blank line is reached.
     The inputs are stored in the `known` hash for later reference.
 <4> This loop reads the contents of the storage file, looking for matches.
-    If the protocol and host from `known` match this line, the program prints the results to stdout and exits.
+    If the protocol, host, and username from `known` match this line, the program prints the results to stdout and exits.
 
 We'll save our helper as `git-credential-read-only`, put it somewhere in our `PATH` and mark it executable.
 Here's what an interactive session looks like: