docs: add :members: to OTLP exporter submodule automodule directives

The trace_exporter, metric_exporter, and _log_exporter entries in
docs/exporter/otlp/otlp.rst had no Sphinx autodoc options, so their
classes were not included in the generated API documentation.

Add :members:, :undoc-members:, and :show-inheritance: to each of the
six submodule automodule directives (three for proto.http, three for
proto.grpc) so the exporter classes appear on the rendered page.

Fixes #2786

Signed-off-by: Ali <alliasgher123@gmail.com>

Author: alliasgher

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- `opentelemetry-exporter-otlp-proto-grpc`, `opentelemetry-exporter-otlp-proto-http`: add `:members:` directives to submodule `automodule` entries in `docs/exporter/otlp/otlp.rst` so that exporter classes appear in the generated API documentation
+  ([#5124](https://github.com/open-telemetry/opentelemetry-python/pull/5124))
 - `opentelemetry-sdk`: add `load_entry_point` shared utility to declarative file configuration for loading plugins via entry points; refactor propagator loading to use it
   ([#5093](https://github.com/open-telemetry/opentelemetry-python/pull/5093))
 - `opentelemetry-sdk`: fix YAML structure injection via environment variable substitution in declarative file configuration; values containing newlines are now emitted as quoted YAML scalars per spec requirement

docs/exporter/otlp/otlp.rst

@@ -14,10 +14,19 @@ opentelemetry.exporter.otlp.proto.http
     :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.http.trace_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.http.metric_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.http._log_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 opentelemetry.exporter.otlp.proto.grpc
 ---------------------------------------
@@ -28,7 +37,16 @@ opentelemetry.exporter.otlp.proto.grpc
     :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.grpc.trace_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.grpc.metric_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 .. automodule:: opentelemetry.exporter.otlp.proto.grpc._log_exporter
+    :members:
+    :undoc-members:
+    :show-inheritance: