[tspb] Remove XXX_ from generated proto

Author: at15

doc/database/m3db/index.md

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+# m3db index
+
+- https://www.slideshare.net/RobSkillington/fosdem-2019-m3-prometheus-and-graphite-with-metrics-and-monitoring-in-an-increasingly-complex-world
+  - Use roaring bitmaps for exact match
+  - FST for regexp?
+- uses a fork of https://github.com/m3db/pilosa

doc/design/index.md

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+# Index
+
+## Reference
+
+- ES
+  - https://www.slideshare.net/RobSkillington/fosdem-2019-m3-prometheus-and-graphite-with-metrics-and-monitoring-in-an-increasingly-complex-world
+  - https://www.elastic.co/blog/found-elasticsearch-from-the-bottom-up
+  - https://www.elastic.co/blog/found-elasticsearch-top-down