Fix grammar issue (#2785)

* Typo `can trigger` repeating twice in the `Eventing Keyspaces` section
* As we only have Data Service, let us be consistent across as Data Service provider seems like another term for Data Service
* Added language feature incorrectly positioned in the removed language features list
* Add item under language restriction; importing libraries is not allowed
* Import libs is restricted
* Fix grammar issue in eventing-language-constructs
* CAS is allowed to be set, albeit, it is a no-op in the upsert operation. Hence it is incorrect to document that upsert does not allow setting CAS for the document.
* Fix grammar issue in eventing-timers.adoc
* Updates after review

---------

Co-authored-by: Simon Dew <[email protected]>

Author: nawazish-couchbase

modules/eventing/pages/eventing-advanced-keyspace-accessors.adoc

@@ -320,7 +320,7 @@ This API indicates errors via the error object in the return value. Exceptions a
 *The Advanced UPSERT operation*: _result = couchbase.upsert(binding, meta, doc)_
 
 This operation allows updating an existing document in the bucket, or if absent, creating a fresh document with the specified key.
-The operation does not allow specifying CAS (it will be silently ignored).
+The operation does not allow you to specify CAS.
 It also allows specifying an expiration time (or TTL) to be set on the document.
 
 Contrast this to the _Basic Bucket Accessor_ SET operation which merely uses an exposed JavaScript map defined via a bucket binding alias "src_col[meta.id] = adoc". 

modules/eventing/pages/eventing-language-constructs.adoc

@@ -116,7 +116,8 @@ This deletes the provided key from the KV bucket the variable is bound to. If th
 === Advanced Keyspace Accessors
 
 The following advanced bucket accessors have been added to expose a richer set of options and operators.  
-Unlike the basic bucket accessors these operations have non-trivial argument sets and return values for complete details refer to xref:eventing-advanced-keyspace-accessors.adoc[Advanced Keyspace Accessors Details].
+Unlike the basic bucket accessors these operations have non-trivial argument sets and return values.
+For complete details refer to xref:eventing-advanced-keyspace-accessors.adoc[].
 
 [#advanced-get-op]
 * *The Advanced GET operation*: _result = couchbase.get(binding, meta)_

modules/eventing/pages/eventing-timers.adoc

@@ -3,7 +3,7 @@
 :page-edition: Enterprise Edition
 
 {description}
-Timers also measure and track the amount of elapsed time and can be used while archiving of expired documents at a preconfigured time.
+Timers also measure and track the amount of elapsed time and can be used while archiving expired documents at a preconfigured time.
 
 NOTE: When using timers, it is required that all nodes of the cluster are synchronized at computer startup, and periodically afterwards using a clock synchronization tool like NTP.