Update alias docs

doc_src/alias.txt

@@ -2,39 +2,36 @@
 
 \subsection alias-synopsis Synopsis
 \fish{synopsis}
+alias
 alias NAME DEFINITION
 alias NAME=DEFINITION
 \endfish
 
 \subsection alias-description Description
 
-`alias` is a simple wrapper for the `function` builtin. It exists for backwards compatibility with Posix shells. For other uses, it is recommended to define a <a href='#function'>function</a>.
+`alias` is a simple wrapper for the `function` builtin, which creates a function wrapping a command. It has similar syntax to POSIX sh `alias`. For other uses, it is recommended to define a <a href='#function'>function</a>.
 
-`fish` does not keep track of which functions have been defined using `alias`. They must be erased using `functions -e`.
+`fish` marks functions that have been created by `alias` by including the command used to craete them in the function description. You can list alias-created functions by running `alias` without arguments. 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.
 
 Note that spaces need to be escaped in the call to alias just like in the commandline _even inside the quotes_.
 
-
 \subsection alias-example Example
 
 The following code will create `rmi`, which runs `rm` with additional arguments on every invocation.
 
 \fish
-alias rmi "rm -i"
+alias rmi="rm -i"
 
 # This is equivalent to entering the following function:
-
-function rmi
+function rmi --wraps rm --description 'alias rmi=rm -i'
     rm -i $argv
 end
 
 # This needs to have the spaces escaped or "Chrome.app..." will be seen as an argument to "/Applications/Google":
-
 alias chrome='/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome banana'
 \endfish