Corrected a typo and added 'code' blocks

Tobias Mueller requested to merge gh-eb66e79e/5/RyuzakiKK/master into master

Created by: RyuzakiKK

This is a small change to README.rst

Without the code block the commands in the section "From git" were all displayed in one line. I added it for every code snippets for consistency. I also added the "cd gnome-keyring" command for complete the install process.

And fixed the typo from "they" to "the".

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