fix links

Author: Kyle Strand

src/items/functions.md

@@ -226,7 +226,7 @@ other ABI supported by the language implementation.
 > **Note**: The LLVM backend of the `rustc` implementation
 > aborts the process by executing an illegal instruction.
 
-[panic-modes]: ../panic.md#panic-runtime
+[panic-modes]: ../panic.md#panic-runtimes
 
 ## Const functions
 

src/linkage.md

@@ -228,4 +228,4 @@ runtime, so this prohibition does not apply to projects compiled with Cargo.
 [`cfg` attribute `target_feature` option]: conditional-compilation.md#target_feature
 [configuration option]: conditional-compilation.md
 [procedural macros]: procedural-macros.md
-[panic-runtime]: panic.md#panic-runtime
+[panic-runtime]: panic.md#panic-runtimes