lighten navigation background to make section labels easier to read for core docs
diff --git a/docs/docsite/_static/core.css b/docs/docsite/_static/core.css
index 8fde5e01ad4e51..5a7b0a1717c54d 100644
--- a/docs/docsite/_static/core.css
+++ b/docs/docsite/_static/core.css
@@ -27,4 +27,4 @@ table.documentation-table .value-name {
     font-weight: bold;
     display: inline;
 }
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+*/table.documentation-table .value-type{font-size:x-small;color:purple;display:inline}table.documentation-table .value-separator{font-size:x-small;display:inline}table.documentation-table .value-required{font-size:x-small;color:red;display:inline}.value-added-in{font-size:x-small;font-style:italic;color:green;display:inline}/*! 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##### SUMMARY
<!--- Describe the change below, including rationale and design decisions -->

<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
updated core.css  to lighten the left-hand navigation background to make section headings easier to see.

Since the diffs are hard to read in a minified css, This PR adds the background value below:

wy-nav-side{top:45px;background:#999}
##### ISSUE TYPE
<!--- Pick one below and delete the rest -->
- Docs Pull Request

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below -->
docs/docsite/_static/core.css 

##### ADDITIONAL INFORMATION
<!--- Include additional information to help people understand the change here -->
<!--- A step-by-step reproduction of the problem is helpful if there is no related issue -->

<!--- Paste verbatim command output below, e.g. before and after your change -->
```paste below

```
