[18.09 backport] Fix yamldocs outputing [flags]
in usage output
#1540
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backport of #1539 for 18.09
A similar change was made in the CLI itself in #1069, but is not inherited by the code that generates the YAML docs.
Before this patch is applied;
With this patch applied:
- How to verify it
run
make -f docker.Makefile yamldocs
and check the generated YAML files indocs/yaml/gen/