Coqify the comments.

theories/algebra/lib/frac_auth.v

@@ -2,9 +2,9 @@ From iris.algebra Require Export frac auth updates local_updates.
 From iris.algebra Require Import proofmode_classes.
 
 (** Authoritative CMRA where the NON-authoritative parts can be fractional.
-  This CMRA allows the original non-authoritative element `◯ a` to be split into
-  fractional parts `◯F{q} a`. Using `◯F a ≡ ◯F{1} a` is in effect the same as
-  using the original `◯ a`. Currently, however, this CMRA hides the ability to
+  This CMRA allows the original non-authoritative element [◯ a] to be split into
+  fractional parts [◯F{q} a]. Using [◯F a ≡ ◯F{1} a] is in effect the same as
+  using the original [◯ a]. Currently, however, this CMRA hides the ability to
   split the authoritative part into fractions.
 *)