fix mistakes in docstrings (#13603)
fix mistakes in docstrings (#13603)

Signed-off-by: Martin Matusiak <805e7797cf7f6cadfe7e6285068651d2ddf767e1@gmail.com>
lyft/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy