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

Commits on Sep 29, 2020

docs: Fix warnings generated when generating docs for v1.15.1
antoniovicente
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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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