Fix some typos

Correct some words spelling for reading more easily.

src/core/tsi/alts/zero_copy_frame_protector/alts_zero_copy_grpc_protector.cc

@@ -105,7 +105,7 @@ static bool read_frame_size(const grpc_slice_buffer* sb,
  * Creates an alts_grpc_record_protocol object, given key, key size, and flags
  * to indicate whether the record_protocol object uses the rekeying AEAD,
  * whether the object is for client or server, whether the object is for
- * integrity-only or privacy-integrity mode, and whether the object is is used
+ * integrity-only or privacy-integrity mode, and whether the object is used
  * for protect or unprotect.
  */
 static tsi_result create_alts_grpc_record_protocol(

src/python/grpcio_tests/tests/unit/_resource_exhausted_test.py

@@ -42,7 +42,7 @@ class _TestTrigger(object):
         self._finish_condition = threading.Condition()
         self._start_condition = threading.Condition()
 
-    # Wait for all calls be be blocked in their handler
+    # Wait for all calls be blocked in their handler
     def await_calls(self):
         with self._start_condition:
             while self._pending_calls < self._total_call_count:

test/core/tsi/alts/zero_copy_frame_protector/alts_zero_copy_grpc_protector_test.cc

@@ -175,7 +175,7 @@ static void seal_unseal_small_buffer(tsi_zero_copy_grpc_protector* sender,
     GPR_ASSERT(tsi_zero_copy_grpc_protector_protect(
                    sender, &var->original_sb, &var->protected_sb) == TSI_OK);
     /* Splits protected slice buffer into two: first one is staging_sb, and
-     * second one is is protected_sb.  */
+     * second one is protected_sb.  */
     uint32_t staging_sb_size =
         gsec_test_bias_random_uint32(
             static_cast<uint32_t>(var->protected_sb.length - 1)) +

tools/internal_ci/README.md

@@ -1,7 +1,7 @@
 # Kokoro CI job configurations and testing scripts
 
-gRPC uses a continous integration tool called "Kokoro" (a.k.a "internal CI")
+gRPC uses a continuous integration tool called "Kokoro" (a.k.a "internal CI")
 for running majority of its open source tests.
 This directory contains the external part of kokoro test job configurations
 (the actual job definitions live in an internal repository) and the shell
-scripts that act as entry points to exectute the actual tests.
+scripts that act as entry points to execute the actual tests.

tools/interop_matrix/README.md

@@ -3,7 +3,7 @@
 This directory contains scripts that facilitate building and running gRPC interoperability tests for combinations of language/runtimes (known as matrix).
 
 The setup builds gRPC docker images for each language/runtime and upload it to Google Container Registry (GCR). These images, encapsulating gRPC stack
-from specific releases/tag, are used to test version compatiblity between gRPC release versions.
+from specific releases/tag, are used to test version compatibility between gRPC release versions.
 
 ## Step-by-step instructions for adding a GCR image for a new release for compatibility test
 We have continuous nightly test setup to test gRPC backward compatibility between old clients and latest server.  When a gRPC developer creates a new gRPC release, s/he is also responsible to add the just-released gRPC client to the nightly test.  The steps are: