Further revise endpoint description to make more natural sounding

nmdc_runtime/api/endpoints/nmdcschema.py

@@ -121,13 +121,14 @@ def list_from_collection(
     You can get all the valid collection names from the [Database class](https://microbiomedata.github.io/nmdc-schema/Database/)
     page of the NMDC Schema documentation.
 
-    Note: If the specified maximum page size is a non-zero number and the specified collection contains _more than that
-          number_ of resources that match the filter criteria, this endpoint will paginate the resources. Pagination
-          can take a long time—especially for collections having many documents.
+    Note: If the specified maximum page size is a number greater than zero, and _more than that number of resources_
+          in the collection match the filter criteria, this endpoint will paginate the resources. Pagination can take
+          a long time—especially for collections that contain a lot of documents (e.g. millions).
 
     **Tips:**
-    1. When the filter includes a regex and you are using that regex to match the beginning of a string, try to use a
-       regex that is a "[prefix expression](https://www.mongodb.com/docs/manual/reference/operator/query/regex/#index-use)."
+    1. When the filter includes a regex and you're using that regex to match the beginning of a string, try to ensure
+       the regex is a [prefix expression](https://www.mongodb.com/docs/manual/reference/operator/query/regex/#index-use),
+       That will allow MongoDB to optimize the way it uses the regex, making this API endpoint be faster.
     """
     # TODO: The note about collection names above is currently accurate, but will not necessarily be accurate, since the
     #       `Database` class could eventually have slots that aren't `multivalued` and `inlined_as_list`, which are