fix reference to old ls param in Lua API docs

also add another example to the ls example commands

docs/Lua API.rst

@@ -928,9 +928,9 @@ can be omitted.
 
   The following examples are equivalent::
 
-    dfhack.run_command({'ls', '-a'})
-    dfhack.run_command('ls', '-a')
-    dfhack.run_command('ls -a')  -- not recommended
+    dfhack.run_command({'ls', 'quick'})
+    dfhack.run_command('ls', 'quick')
+    dfhack.run_command('ls quick')  -- not recommended
 
 * ``dfhack.run_command_silent(command[, ...])``
 

docs/builtins/ls.rst

@@ -25,11 +25,13 @@ Usage
 Examples
 --------
 
-- ``ls adventure``
-    Lists all commands with the ``adventure`` tag.
-- ``ls --dev trigger``
-    Lists all commands, including developer and modding commands, that match the
-    substring "trigger"
+``ls quick``
+    List all commands that match the substring "quick".
+``ls adventure``
+    List all commands with the ``adventure`` tag.
+``ls --dev trigger``
+    List all commands, including developer and modding commands, that match the
+    substring "trigger".
 
 Options
 -------