Remain consistent across code examples

The blocks demonstrate different things, but it's confusing to have different code - mixing both behavior changes through context and unnecessary code changes.

Author: Kissaki

book/modules/using_modules.md

@@ -193,7 +193,7 @@ assert true
 # => Assertion passes
 
 hide assert
-assert equal 1 1
+assert equal 1 2
 # => Error:
 # => help: A command with that name exists in module `assert`. Try importing it with `use`
 
@@ -208,7 +208,7 @@ Just as you can `use` a subset of the module's definitions, you can also `hide`
 ```nu
 use std/assert
 hide assert main
-assert equal 1 1
+assert equal 1 2
 # => assertion passes
 
 assert true