fix broken link

packages/documentation/docs/reference/chords.mdx

@@ -136,7 +136,7 @@ For more consistency, <CM/> normalizes the chords symbols at rendering time.
 <TabbedChordMark src={'CMAJ7\nC^\nCM7\nCΔ\nCmajor7'} />
 
 Under the hood, <CM/> uses the powerful <CS/> library, which is capable of parsing virtually any chord symbol
-and performs the normalization based on [widely recognized conventions](https://github.com/no-chris/chord-symbol#background-information).
+and performs the normalization based on [widely recognized conventions](https://github.com/no-chris/chord-symbol/tree/master/packages/chord-symbol#background-information).
 
 This normalization can also, sometimes, speed up the writing process: