(PUP-12063) Fix rendering of atime & ctime

Just pass a string instead of code to the `desc` method so that it can
be rendered correctly by puppet-strings.

Author: joshcooper

lib/puppet/type/file/ctime.rb

@@ -2,9 +2,9 @@
 
 module Puppet
   Puppet::Type.type(:file).newproperty(:ctime) do
-    desc %q(A read-only state to check the file ctime. On most modern \*nix-like
+    desc "A read-only state to check the file ctime. On most modern \*nix-like
       systems, this is the time of the most recent change to the owner, group,
-      permissions, or content of the file.)
+      permissions, or content of the file."
 
     def retrieve
       current_value = :absent

lib/puppet/type/file/mtime.rb

@@ -2,8 +2,8 @@
 
 module Puppet
   Puppet::Type.type(:file).newproperty(:mtime) do
-    desc %q(A read-only state to check the file mtime. On \*nix-like systems, this
-      is the time of the most recent change to the content of the file.)
+    desc "A read-only state to check the file mtime. On \*nix-like systems, this
+      is the time of the most recent change to the content of the file."
 
     def retrieve
       current_value = :absent