Documentation edits: cosmetic

overview/architecture_overview.rst
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   * Fixed dup "have been have been"

overview/lab_setup.rst
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   * Correct VOLTHA cases and s/the/this/.

release_notes/release_process.rst
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   * Updated jira notes to be more descriptive wrt edits needed.

Change-Id: I780a0835787f5e7d658c9b63451c78809114f9c9
4 files changed