Docs: Update thrift.asciidoc

Fix typos, add clarifications and link.

Closes #7678

docs/reference/modules/thrift.asciidoc

@@ -1,11 +1,11 @@
 [[modules-thrift]]
 == Thrift
 
-The thrift transport module allows to expose the REST interface of
+The https://thrift.apache.org/[thrift] transport module allows to expose the REST interface of
 elasticsearch using thrift. Thrift should provide better performance
 over http. Since thrift provides both the wire protocol and the
-transport, it should make using it simpler (thought its lacking on
-docs...).
+transport, it should make using Elasticsearch more efficient (though it has limited
+documentation).
 
 Using thrift requires installing the `transport-thrift` plugin, located
 https://github.com/elasticsearch/elasticsearch-transport-thrift[here].