fix compiler plugins path in doc/reference.md
@@ -1977,7 +1977,7 @@ For any lint check `C`:
The lint checks supported by the compiler can be found via `rustc -W help`,
along with their default settings. [Compiler
-plugins](book/plugins.html#lint-plugins) can provide additional lint checks.
+plugins](book/compiler-plugins.html#lint-plugins) can provide additional lint checks.
```{.ignore}
mod m1 {
@@ -3647,4 +3647,4 @@ that have since been removed):
pattern syntax
[ffi]: book/ffi.html
-[plugin]: book/plugins.html
+[plugin]: book/compiler-plugins.html
