Small Corrections to 'The Smart Protocol/Downloading Data/SSH' Section

[mobsceneZ]

There's no existing/similar bug report.

• [X] I have searched the existing issues

This report is about a single actionable bug.

• [X] I'm reporting a single actionable bug

This report is about the ProGit book, version 2, English language.

• [X] This bug is not about a translation or old version

Bug covers book website/pdf

• [X] I confirm the bug is about the book as found on the website/pdf

Problem is present in the Pro Git book on the website?

• [X] This bug also affects the Pro Git book as published on the website.

Which version of the book is affected?

Source files

Describe the bug:

In Git Internals/Transfer Protocols/The Smart Protocol/Downloading Data/SSH section, ProGit2 claims the first response from server side looks something like this:

00dfca82a6dff817ec66f44342007202690a93763949 HEAD□multi_ack thin-pack \
	side-band side-band-64k ofs-delta shallow no-progress include-tag \
	multi_ack_detailed symref=HEAD:refs/heads/master \
	agent=git/2:2.1.1+github-607-gfba4028
003fe2409a098dc3e53539a9028a94b6224db9d6a6b6 refs/heads/master
0000

For me, the refs/heads/master's SHA-1 value looks strange, since HEAD now symbolically links to refs/heads/master, the listed SHA-1 should be same. To confirm this, I manually cloned the simplegit-progit repository and tried following commands:

$ git cat-file -p e2409a098dc3e53539a9028a94b6224db9d6a6b6
fatal: Not a valid object name e2409a098dc3e53539a9028a94b6224db9d6a6b6

The object that corresponds to this SHA-1 value doesn't even exist. Therefore, I think the SHA-1 value of refs/heads/master should be corrected.

Steps to reproduce:

1. Please refer to book/10-git-internals/sections/transfer-protocols.asc

Expected behavior:

The SHA-1 value of refs/heads/master should be ca82a6dff817ec66f44342007202690a93763949.

Screenshots:

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Additional context:

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