Fix grammar in context injection section.

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

index.html

@@ -1666,18 +1666,18 @@ <h3>Context Injection</h3>
           </p>
 
           <p>
-If a `@context` property is not provided in a document that is being secured or
-verified, or the Data Integrity terms used in the document are not defined by
+If an `@context` property is not provided in a document that is being secured or
+verified, or the Data Integrity terms used in the document are not mapped by
 existing values in the `@context` property, implementations MUST inject or add
 an `@context` property with a value of
 `https://www.w3.org/ns/data-integrity/v1`.
           </p>
 
           <p>
-An example of when context injection is unnecessary is when the Verifiable
+One example of when context injection is expected to be unnecessary is when the Verifiable
 Credential Data Model v2.0 context (`https://www.w3.org/ns/credentials/v2`)
-exists as a value in the `@context` property, as that context defines all of the
-necessary Data Integrity terms defined by
+exists as a value in the `@context` property, as that context maps all of the
+necessary Data Integrity terms that were previously mapped by
 `https://www.w3.org/ns/data-integrity/v1`.
           </p>
         </section>