AETHER-2011 (part1)

Add basic 1.5 release documentation framework

Update edge deployment docs

- Describe different topologies and add deployment diagrams
- Split out Pronto BOM and diagrams
- Make BESS diagram a SVG

Updates to Sphinx and modules, fixed linkcheck to have a timeout/retry
for faulty webservers.

Fix spelling and formatting issue across entire site, remove "Smart
quotes" that cause the spellchecker to throw errors. Add many more
dictionary entries. Make spelling fail the build.  Fix all spelling and
grammar errors that triggered failures.

Add autosectionlabel, and manage duplicate section names where they
existed.

Updated readme on image/diagram embedding

Added docs on PoE power cycle with Aruba switches (Pronto)

Change-Id: I7f9f7afae13788f9fe29bfe2683a295ba7b8914e
diff --git a/testing/about_system_tests.rst b/testing/about_system_tests.rst
index 02f97d5..fcba383 100644
--- a/testing/about_system_tests.rst
+++ b/testing/about_system_tests.rst
@@ -9,7 +9,7 @@
 provides highly scalable and low maintenance code which will help cover various
 categories of tests.  Framework includes libraries and tools that allows both
 component level and integration level tests. Robot Framework will be used for
-covering integration tests. Component level test coverages have been
+covering integration tests. Component level test coverage have been
 accomplished by leveraging the existing test frameworks that were developed in
 their respective projects. Component level tests include tests for TOST, PDP,
 SD-CORE areas. For detailed information on component tests, please see their