Update documentation.md

The4codeblocks · web-flow · commit 597239dc30bb · 2023-07-13T15:46:47.000+02:00
diff --git a/documentation.md b/documentation.md
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 ## compression_api Documentation
-#
+
+# Functions
 `compression.darken_tiles(tiles, count)`: Darkens every tile in the `tiles` table `count` times.
 
 `compression.register_compressed_tiers(node)`: Registers compressed versions of the provided `node`; If the provided node has been compressed previously, `groups.compressed` must be set to however many times it has been compressed. (eg. `moreblocks:cobble_compressed` must have a `groups.compressed` value of `1`.)
