fix readme format (#12797)

Originally, the tabbed content under 'If pre-built frontend files are present it is possible to only build the backend:‘ has tab within the tabbed content. This commit fixed it.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
release/v1.15
Marshmallow 2020-09-11 01:05:15 +08:00 committed by GitHub
parent c3e8c9441a
commit 4d1c41d4e2
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