docs: fix imports for pymongo and psycopg2 (#723)

Incorrect import documentation in both pymongo and psycopg2.

Author: majorgreys

ext/opentelemetry-ext-psycopg2/src/opentelemetry/ext/psycopg2/__init__.py

@@ -26,7 +26,7 @@
     import psycopg2
     from opentelemetry import trace
     from opentelemetry.sdk.trace import TracerProvider
-    from opentelemetry.trace.ext.psycopg2 import Psycopg2Instrumentor
+    from opentelemetry.ext.psycopg2 import Psycopg2Instrumentor
 
     trace.set_tracer_provider(TracerProvider())
 

ext/opentelemetry-ext-pymongo/src/opentelemetry/ext/pymongo/__init__.py

@@ -26,7 +26,7 @@
     from pymongo import MongoClient
     from opentelemetry import trace
     from opentelemetry.trace import TracerProvider
-    from opentelemetry.trace.ext.pymongo import PymongoInstrumentor
+    from opentelemetry.ext.pymongo import PymongoInstrumentor
 
     trace.set_tracer_provider(TracerProvider())