create-plugin.mdx (Creating Plugins - Client Plugin API)
create-plugin.mdx (Creating Plugins - Client Plugin API)

Summary: Restyle of page, including changes to spelling, grammar, links, and structure (where relevant).

Reviewed By: aigoncharov

Differential Revision: D36626315

fbshipit-source-id: 735160f8d1f1365a8aab7fb1cd3e99b724025e3a

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