Update README.md

Author: PistonMiner

README.md

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 This contains the tools for Paper Mario: The Thousand Year Door I have built. Most of these were built completely blind without any debug information.
-  * ttydasm: Disassembler for the event command scripting language
+  * docs: Not a tool, this folder contains various pieces documentation
+  * ttydasm: Disassembler for the event command scripting language
+  * rellink: REL file linking tool