Update 01-chapter7.markdown

Global variables are not necessary to demonstrate anything in this script. Tested:

% cat foo.rb
#!/usr/bin/env ruby

refname = ARGV[0]
oldrev  = ARGV[1]
newrev  = ARGV[2]
user    = ENV['USER']

puts "Enforcing Policies... \n(#{refname}) (#{oldrev[0,6]}) (#{newrev[0,6]})"

% ./foo.rb refs/heads/what $(git rev-parse HEAD) $(git rev-parse HEAD~~)
Enforcing Policies...
(refs/heads/what) (27240a) (ae2ef7)
Update command line output in Chapter 2

The command line output in the examples is slightly inconsistent with the
latest version; git doesn't strip content from the commit message.
[es] Update chapter 3: fixed markdown mistake

Fixed wrong character to indicate markdown span of code:
There was made with apostrophes instead of backtick quotes

Signed-off-by: Carlos Arturo Guerra Parra <carlosarturoguerra@gmail.com>
[es] Update chapter 3: fixed some mistakes

* Suspension points had 4 or 5 points instead of 3.
* Closing exclamation mark not opened.
[es] Fixed some orthography mistakes
Merge pull request #764 from pepr/master

[cs] Several corrections and additions to the content + plus the experiment to solve #762
Merge pull request #763 from mesjetiu/es_chapter_3

[es] chapter 3: Fixed some mistakes
Merge pull request #761 from technmsg/patch-1

[en] Update command line output in Chapter 2
Merge pull request #756 from iosias/master

Update 01-chapter7.markdown