general: Reformat documentation with better formatting and wording

General purpose reformating and rewording in (a few places). This should
also make markdown linting happier.

Prefer back-ticks wherever useful and use `console` for code blocks to
be executed on terminal.

Also, update references links wherever possible (including update from
'http://' to 'https://').

modules/ssh/README.md

@@ -1,26 +1,23 @@
-SSH
-===
+# SSH
 
-Provides for an easier use of [SSH][1] by setting up [ssh-agent][2].
+Provides for an easier use of [SSH][1] by setting up [*ssh-agent*][2].
 
-Settings
---------
+## Settings
 
 ### Identities
 
-To load multiple identities, add the following line to *zpreztorc*:
+To load multiple identities, add the following line to *~/.zpreztorc*:
 
 ```sh
 zstyle ':prezto:module:ssh:load' identities 'id_rsa' 'id_dsa' 'id_github'
 ```
 
-Authors
--------
+## Authors
 
 *The authors of this module should be contacted via the [issue tracker][3].*
 
-  - [Sorin Ionescu](https://github.com/sorin-ionescu)
+[Sorin Ionescu](https://github.com/sorin-ionescu)
 
-[1]: http://www.openssh.com
-[2]: http://www.openbsd.org/cgi-bin/man.cgi?query=ssh-agent&sektion=1
+[1]: https://www.openssh.com
+[2]: https://www.openbsd.org/cgi-bin/man.cgi?query=ssh-agent&sektion=1
 [3]: https://github.com/sorin-ionescu/prezto/issues