corrected instrumentation example in urllib3

Author: yashaswi2000

CHANGELOG.md

@@ -31,6 +31,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed urllib3 instrumentation example in instrumentation documentation
+  ([#1793](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1793))
 - Fix elasticsearch db.statement attribute to be sanitized by default
   ([#1758](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1758))
 - Fix `AttributeError` when AWS Lambda handler receives a list event

instrumentation/opentelemetry-instrumentation-urllib3/README.rst

@@ -38,8 +38,8 @@ The hooks can be configured as follows:
     def response_hook(span, request, response):
         pass
 
-    URLLib3Instrumentor.instrument(
-        request_hook=request_hook, response_hook=response_hook)
+    URLLib3Instrumentor().instrument(
+        request_hook=request_hook, response_hook=response_hook
     )
 
 Exclude lists

instrumentation/opentelemetry-instrumentation-urllib3/src/opentelemetry/instrumentation/urllib3/__init__.py

@@ -56,8 +56,8 @@ def request_hook(span, request):
     def response_hook(span, request, response):
         pass
 
-    URLLib3Instrumentor.instrument(
-        request_hook=request_hook, response_hook=response_hook)
+    URLLib3Instrumentor().instrument(
+        request_hook=request_hook, response_hook=response_hook
     )
 
 Exclude lists