Update installation.md

Updated the version of Git used in the section for compiling Git from source.

Also, changed the verbiage used in the section "Initialize Database and Activate Advanced Features". It previously said to type 'yes' to install the database.

doc/install/installation.md

@@ -92,8 +92,8 @@ Is the system packaged Git too old? Remove it and compile from source.
 
     # Download and compile from source
     cd /tmp
-    curl --progress https://git-core.googlecode.com/files/git-1.8.4.1.tar.gz | tar xz
-    cd git-1.8.4.1/
+    curl --progress https://git-core.googlecode.com/files/git-1.8.5.2.tar.gz | tar xz
+    cd git-1.8.5.2/
     make prefix=/usr/local all
 
     # Install into /usr/local/bin
@@ -266,7 +266,7 @@ Make sure to edit both `gitlab.yml` and `unicorn.rb` to match your setup.
 
     sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production
 
-    # Type 'yes' to create the database.
+    # Type 'yes' to create the database tables.
 
     # When done you see 'Administrator account created:'