changed description wording (Draegerwerk#55)

// changed the wording of the first step for the transition of the
manipulations
TransitionFromCreateStateWithIdentificationToRemoveIdentification and
TransitionFromCreateStateWithIdentificationToChangeIdentification

# Checklist

The following aspects have been respected by the author of this pull
request, confirmed by both pull request assignee **and** reviewer:

* Changelog update (necessity checked and entry added or not added
respectively)
  * [x] Pull Request Assignee
  * [x] Reviewer
* README update (necessity checked and entry added or not added
respectively)
  * [x] Pull Request Assignee
  * [x] Reviewer

src/t2iapi/context/service.proto

@@ -81,18 +81,18 @@ service ContextService {
 
   /*
   For the Context with the provided descriptor handle perform the following transition:
-  - create a new associated pm:AbstractContextState instance with at least one unique pm:Identification element
+  - associate a pm:AbstractContextState instance with at least one unique pm:Identification element
     for the Context with the given descriptor handle
-  - remove at least one pm:Identification element for the previously created pm:AbstractContextState.
+  - remove at least one pm:Identification element for the previously associated pm:AbstractContextState.
  */
   rpc TransitionFromCreateStateWithIdentificationToRemoveIdentification (BasicHandleRequest)
       returns (CreateContextStateWithAssociationResponse);
 
   /*
   For the Context with the provided descriptor handle perform the following transition:
-  - create a new associated pm:AbstractContextState instance with at least one unique pm:Identification element
+  - associate a pm:AbstractContextState instance with at least one unique pm:Identification element
     for the Context with the given descriptor handle
-  - change at least one already present pm:Identification element for the previously created pm:AbstractContextState.
+  - change at least one already present pm:Identification element for the previously associated pm:AbstractContextState.
  */
   rpc TransitionFromCreateStateWithIdentificationToChangeIdentification (BasicHandleRequest)
       returns (CreateContextStateWithAssociationResponse);