fix formatting

index.bs

@@ -14400,19 +14400,19 @@ described in the previous section).
 
     To <dfn id="invoke-a-callback-function" export>invoke</dfn> a
     [=callback function type=] value |callable| with a [=Web IDL arguments list=] |args|,
-    exception behavior |exceptionBehavior| (either "`report`" or "`rethrow`"),
+    exception behavior |exceptionBehavior| (either "<code>report</code>" or "<code>rethrow</code>"),
     and an optional [=callback this value|callback this value=] |thisArg|,
     perform the following steps.
     These steps will either return an IDL value or throw an exception.
 
     The |exceptionBehavior| argument must be supplied if, and only if, |callable|'s
     [=return type=] is not a [=promise type=]. If |callable|'s return type is neither
-    {{undefined}} nor {{any}}, it may not be "`report`".
+    {{undefined}} nor {{any}}, it may not be "<code>report</code>".
 
     <div class="XXX">
         Until call sites are updated to respect this, specifications which fail to
-        provide a value here when it would be mandatory should be read to supply
-        "`rethrow`".
+        provide a value here when it would be mandatory should be understood as
+        supplying "<code>rethrow</code>".
     </div>
 
     1.  Let |completion| be an uninitialized variable.
@@ -14445,8 +14445,8 @@ described in the previous section).
         1.  [=Clean up after running script=] with |relevant settings|.
         1.  If |completion| is an IDL value, return |completion|.
         1.  [=Assert=]: |completion| is an [=abrupt completion=].
-        1.  If |exceptionBehavior| is "`rethrow`", throw |completion|.\[[Value]].
-        1.  Otherwise, if |exceptionBehavior| is "`report`":
+        1.  If |exceptionBehavior| is "<code>rethrow</code>", throw |completion|.\[[Value]].
+        1.  Otherwise, if |exceptionBehavior| is "<code>report</code>":
             1.  [=Assert=]: |callable|'s [=return type=] is {{undefined}} or {{any}}.
             1.  [=Report an exception=] |completion|.\[[Value]] for |realm|'s [=realm/global object=].
             1.  Return the unique {{undefined}} IDL value.