docs: fix examples to use _CORPUS instead of _KYTHE_CORPUS
The yaml templates use _CORPUS as the variable name.
@@ -110,21 +110,21 @@ gcloud builds submit --no-source --config kythe/extractors/gcp/bazel/bazel.yaml
--substitutions=_REPO=https://github.com/angular/angular.git,\
_COMMIT=8accc98d28249628e84136d7306fdbbe1f4caaef,\
_BUCKET_NAME=$BUCKET_NAME,\
-_KYTHE_CORPUS=github.com/angular/angular
+_CORPUS=github.com/angular/angular
# Extract github.com/bazelbuild/bazel at commit 22d375b
gcloud builds submit --no-source --config kythe/extractors/gcp/bazel/bazel.yaml \
--substitutions=_REPO=https://github.com/bazelbuild/bazel.git,\
_COMMIT=22d375bd532b04bb83f18a7770e5080e23a1d517,\
_BUCKET_NAME=$BUCKET_NAME,\
-_KYTHE_CORPUS=github.com/bazelbuild/bazel
+_CORPUS=github.com/bazelbuild/bazel
# Extract github.com/protocolbuffers/protobuf at commit e728325
gcloud builds submit --no-source --config kythe/extractors/gcp/bazel/bazel.yaml \
--substitutions=_REPO=https://github.com/protocolbuffers/protobuf.git,\
_COMMIT=e7283254d6eb01ddfdb63cc3c89cd312e2d354d5,\
_BUCKET_NAME=$BUCKET_NAME,\
-_KYTHE_CORPUS=github.com/protocolbuffers/protobuf
+_CORPUS=github.com/protocolbuffers/protobuf
```
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