Docs for dataFileSuffixes and dataFileDirBaseNameOverride config options

[zachleat]

eleventy/src/defaultConfig.js

Lines 94 to 99 in d0ab038

	// Renamed from `jsDataFileSuffix` in 2.0 (and swapped to an Array)
	// If you remove "" we won’t look for dir/dir.json or file.json
	dataFileSuffixes: [".11tydata", ""],
	// "index" will look for `directory/index.*` directory data files instead of `directory/directory.*`
	dataFileDirBaseNameOverride: false,

Note that using the previous API (jsDataFileSuffix) maintains backwards compatibility in the implementation for 2.0

#1699

[zachleat]

Needs updating (may not be comprehensive):

1. https://www.11ty.dev/docs/config/#change-file-suffix-for-template-and-directory-data-files
2. https://www.11ty.dev/docs/data-template-dir/
3. https://www.11ty.dev/docs/data-custom/#example

[zachleat]

Docs shipping to the above URLs