[DOCS] [7.x] Adding headers in TOC for aggregation docs. (#66604)#66607

Merged

lockewritesdocs merged 1 commit intoelastic:7.xfrom lockewritesdocs:docs__metric-aggs-toc-fix-7.x

Dec 18, 2020

+21-14

Commits on Dec 18, 2020

[DOCS] Adding headers in TOC for aggregation docs. (elastic#66604 )
Adam Locke
committed