docs: Fix release notes for v1.15.1 release.#13318

Merged

mattklein123 merged 3 commits intoenvoyproxy:release/v1.15from antoniovicente:docs-v1.15.1

Sep 30, 2020

+30-23

Commits on Sep 29, 2020

docs: Fix warnings generated when generating docs for v1.15.1
antoniovicente
committed
Set name to v1.15.1.rst instead of current.rst to bypass format check that requires release notes to end with '.', trigged by ':'
antoniovicente
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bump version to 1.15.2
antoniovicente
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