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/fasd/README.md

@@ -1,5 +1,4 @@
-Fasd
-====
+# Fasd
 
 [Fasd][1] is a command-line productivity booster, inspired by tools like
 [autojump][2], [z][3] and [v][4], it offers quick access to files and
@@ -12,30 +11,27 @@ module.
 The Prezto Fasd configuration differs from the default. The default aliases have
 been disabled.
 
-Installation
-------------
+## Installation
 
-`fasd` is bundled with prezto as a git submodule. Alternatively, you can manually install `fasd`.
-If a manual install is found, it will be used instead of the bundled version.
+`fasd` is bundled with prezto as a git submodule. Alternatively, you can
+manually install `fasd`. If a manual installation is found, it will be used
+instead of the bundled version.
 
-Aliases
--------
+## Aliases
 
-  - `j` changes the current working directory interactively.
+- `j` changes the current working directory interactively.
 
-Completion
-----------
+## Completion
 
 Type `,`, `f,`, `d,` in front of a comma-separated query or type `,,`,  `,,f`,
-`,,d` at the end of a comma-separated query then hit <kbd>tab</kbd>.
+`,,d` at the end of a comma-separated query then hit <kbd>TAB</kbd>.
 
-Authors
--------
+## Authors
 
 *The authors of this module should be contacted via the [issue tracker][5].*
 
-  - [Wei Dai](https://github.com/clvv)
-  - [Sorin Ionescu](https://github.com/sorin-ionescu)
+- [Wei Dai](https://github.com/clvv)
+- [Sorin Ionescu](https://github.com/sorin-ionescu)
 
 [1]: https://github.com/clvv/fasd
 [2]: https://github.com/joelthelion/autojump