Fix error when describing the Smart Protool

Author: mildsunrise

book/10-git-internals/sections/transfer-protocols.asc

@@ -153,8 +153,8 @@ $ ssh -x git@server "git-receive-pack 'simplegit-progit.git'"
 The `git-receive-pack` command immediately responds with one line for each reference it currently has – in this case, just the `master` branch and its SHA-1.
 The first line also has a list of the server's capabilities (here, `report-status`, `delete-refs`, and some others, including the client identifier).
 
-Each line starts with a 4-character hex value specifying how long the rest of the line is.
-Your first line starts with 00a5, which is hexadecimal for 165, meaning that 165 bytes remain on that line.
+Each line starts with a 4-character hex value specifying how long the whole the line is (including the 4-character length itself and the trailing linefeed).
+Your first line starts with 00a5, which is hexadecimal for 165, meaning the line is 165 bytes long.
 The next line is 0000, meaning the server is done with its references listing.
 
 Now that it knows the server's state, your `send-pack` process determines what commits it has that the server doesn't.