cargo xtask tidy

docs/book/src/contributing/lsp-extensions.md

@@ -1,5 +1,5 @@
 <!---
-lsp/ext.rs hash: af70cce5d6905e39
+lsp/ext.rs hash: 3549077514b37437
 
 If you need to change the above hash to make the test pass, please check if you
 need to adjust this doc as well and ping this issue:

xtask/src/tidy.rs

@@ -46,7 +46,7 @@ lsp/ext.rs was changed without touching lsp-extensions.md.
 Expected hash: {expected_hash:x}
 Actual hash:   {actual_hash:x}
 
-Please adjust docs/dev/lsp-extensions.md.
+Please adjust docs/book/src/contributing/lsp-extensions.md.
 "
         )
     }