Make line length, wrapping and spacing consistent

doc_src/alias.txt

@@ -13,10 +13,12 @@ alias NAME=DEFINITION
 `fish` does not keep track of which functions have been defined using `alias`. They must be erased using `functions -e`.
 
 - `NAME` is the name of the alias
+
 - `DEFINITION` is the actual command to execute. The string `$argv` will be appended.
 
 You cannot create an alias to a function with the same name.
 
+
 \subsection alias-example Example
 
 The following code will create `rmi`, which runs `rm` with additional arguments on every invocation.