Fix grammar in at risk marker for multibit status.

Co-authored-by: Ted Thibodeau Jr <[email protected]>

CONTRIBUTING.md

@@ -9,9 +9,9 @@ in the relevant W3C Working Group or make a non-member patent licensing
 commitment.
 
 If you are not the sole contributor to a contribution (pull request), please
-identify all  contributors in the pull request comment.
+identify all contributors in the pull request comment.
 
-To add a contributor (other than yourself, that's automatic), mark them one per
+To add a contributor (other than yourself; that's automatic), mark them one per
 line as follows:
 
 ```

index.html

@@ -462,13 +462,13 @@ <h3>BitstringStatusListCredential</h3>
 
         <p class="issue atrisk"
            title="Bitstring entry sizes greater than 1 are at risk.">
-The Working Group is currently seeking implementer feedback with respect to the
-usefulness of bitstring entries that have sizes greater than one. The
-approach adds complexity to the solution and its not clear if there is
-enough of an implementation community to support the feature. The WG is
-considering three options 1) keep the feature, 2) allow the feature to be
-optionally supported, and 3) remove the feature. At present, the specification
-implements the second option.
+The Working Group is currently seeking implementer feedback regarding the
+utility of bitstring entries that have sizes greater than one. Supporting
+such entries adds complexity to the solution, and it's not clear whether there
+is enough of an implementation community to support the feature. The WG is
+considering three options: (1) require conforming implementations to support
+the feature; (2) allow implementations to optionally support the feature; or
+(3) remove the feature. At present, the specification implements option (2).
         </p>
 
         <table class="simple">