It helps to have plugins living in one common area, because it signals
to users the mechanisms for controlling them, which are typically driven
by keymaps and autocmds rather than builtin options.
We can always revisit if plugins.txt gets "too big" (for example, we may
want to introduce "project.txt" for the project concept, where
editorconfig and 'exrc' are relevant), but for now it's rather unusual
for editorconfig.txt to have its own dedicated helpfile.
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