[utility] Update documentation for 'safe-ops'

Update formatting and wordings to be more consistent with rest of prezto
documentation.

modules/utility/README.md

@@ -109,9 +109,11 @@ Aliases
 
 ### Safe ops
 
-By default, `cp`,`ln`, `mv`, and `rm` are aliased to their interactive variants.
-If this is not desired, you can disable it by adding
-`zstyle ':prezto:module:utility' safe-ops no` to your zpreztorc.
+By default, `cp`,`ln`, `mv` and `rm` are aliased to their interactive variants.
+If this is not desired, it can be disabled by adding the following line to
+*zpreztorc*:
+
+    zstyle ':prezto:module:utility' safe-ops 'no'.
 
 In addition, the following aliases have been added:
 

runcoms/zpreztorc

@@ -191,7 +191,7 @@ zstyle ':prezto:module:prompt' theme 'sorin'
 # Utility
 #
 
-# safe-ops is enabled by default. This aliases rm, mv, cp, and ln so that they
-# prompt before deleting or copying over files. Set to no to disable this safer
+# Enabled safe options. This aliases cp, ln, mv and rm so that they prompt
+# before deleting or overwriting files. Set to 'no' to disable this safer
 # behavior.
-# zstyle ':prezto:module:utility' safe-ops yes
+# zstyle ':prezto:module:utility' safe-ops 'yes'