Update Nushell Book with copy-able examples. (#1692)

* fix typo in tmp/random

* fix typo in stat git

* update book docs with proper copy-able examples

* update de book and contributor book

* Update book/environment.md

Co-authored-by: Douglas <[email protected]>

* Update de/book/loading_data.md

Co-authored-by: Douglas <[email protected]>

* Update book/pipelines.md

Co-authored-by: Douglas <[email protected]>

* Update book/types_of_data.md

Co-authored-by: Douglas <[email protected]>

* fix indentations

* fix indentations

---------

Co-authored-by: Joshua Nussbaum <[email protected]>
Co-authored-by: Douglas <[email protected]>

Author: 0x4D5352

book/3rdpartyprompts.md

@@ -25,10 +25,10 @@ If you like [oh-my-posh](https://ohmyposh.dev/), you can use oh-my-posh with Nus
 
 ```nu
 # Generate the .oh-my-posh.nu file
-> oh-my-posh init nu --config ~/.poshthemes/M365Princess.omp.json
+oh-my-posh init nu --config ~/.poshthemes/M365Princess.omp.json
 
 # Initialize oh-my-posh.nu at shell startup by adding this line in your config.nu file
-> source ~/.oh-my-posh.nu
+source ~/.oh-my-posh.nu
 ```
 
 For MacOS users:

book/aliases.md

@@ -5,19 +5,19 @@ Aliases in Nushell offer a way of doing a simple replacement of command calls (b
 For example, let's create an alias called `ll` which will expand to `ls -l`.
 
 ```nu
-> alias ll = ls -l
+alias ll = ls -l
 ```
 
 We can now call this alias:
 
 ```nu
-> ll
+ll
 ```
 
 Once we do, it's as if we typed `ls -l`. This also allows us to pass in flags or positional parameters. For example, we can now also write:
 
 ```nu
-> ll -a
+ll -a
 ```
 
 And get the equivalent to having typed `ls -l -a`.