Fix grammar for restrictions on identifiers.

Co-authored-by: Ted Thibodeau Jr 

Author: msporny

index.html

@@ -1590,20 +1590,20 @@ DID Controller
         <h3>Identifier Restrictionsh3>
         <p>
 Identifiers used in a [=DID document=] to identify a [=DID subject=] or a [=DID
-Controller=] do not allow the use of query parameters or fragment identifiers.
+Controller=] cannot use query parameters or fragment identifiers.
 Implementers are urged to pay particular attention to the list of allowable
 characters in Section [[[#did-syntax]]] which makes this requirement clear; the
 syntax does not include the `?` character nor the `#` character. This is in
 contrast to identifiers used in a [=DID document=] to identify a [=verification
 method=] or a [=service=], which follow the syntax rules in Section
-[[[#did-url-syntax]]], which does allow the use of query parameters and fragment
+[[[#did-url-syntax]]], which do allow the use of query parameters and fragment
 identifiers. Even so, the use of query parameters in long-lived canonical
-identifiers used in [=DID=] ecosystems is discouraged as it can increase the
+identifiers made for [=DID=] ecosystems is discouraged as it can increase the
 complexity of [=DID resolution=] software and potentially lead to a larger
 security attack surface. Fragment identifiers are also expected to be unique
-within a particular [=DID document=] and are discouraged from being re-used
-across time to refer to different [=resources=], such as two different
-[=verification methods=] within the same [=DID document=].
+within a particular [=DID document=] and implementers are discouraged from
+reusing them to refer to different [=resources=] over time, such as two
+different [=verification methods=] within the same [=DID document=].
         p>
       section>