docs: Fix formatting of GCE_METADATA_HOST
#890
Merged
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The existing docs only show
![Screen Shot 2021-10-16 at 9 06 11 AM](https://user-images.githubusercontent.com/21353794/137594372-efc456ac-8a44-4566-85ed-6a992148c3c0.png)
GCE_METADATA_ROOT
. This PR adds a space between them so that Sphinx will separate them into separate entries.The new HTML: