Dont run CI on pr events

.github/workflows/interop.yml

@@ -1,5 +1,5 @@
 name: interop
-on: [push,pull_request]
+on: [push]
 jobs:
   test:
     runs-on: ${{ matrix.os }}

.github/workflows/test.yml

@@ -1,5 +1,5 @@
 name: test
-on: [push,pull_request]
+on: [push]
 jobs:
   test:
     runs-on: ${{ matrix.os }}

tonic/src/lib.rs

@@ -24,6 +24,9 @@
 //!
 //! - `transport`: Enables the fully featured, batteries included client and server
 //! implementaiton based on [`hyper`], [`tower`] and [`tokio`].
+//! - `codegen`: Enables all the required exports and optional dependencies required
+//! for [`tonic-build`].
+//!
 //!
 //! # Generic implementation
 //!