doc/lua-filters.md: unify, fix anchors and internal links (#6061)

Links and anchors now follow consistent conventions, like lowercase-only
anchor names.

This breaks some links to specific sections in the document, but will
make it much easier to link documentation in the future.
This commit is contained in:
Albert Krewinkel 2020-01-11 20:55:02 +01:00 committed by John MacFarlane
parent e98921ae57
commit d09bcc7f16

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