Update docs/DifferentiableProgrammingImplementation.md

Co-authored-by: Saleem Abdulrasool <[email protected]>

Author: philipturner

docs/DifferentiableProgrammingImplementation.md

@@ -787,7 +787,7 @@ Multiple basic blocks and control flow basic block terminators (`cond_br`, `swit
 
 > TODO: **Explain the control flow differentiation approach.** The approach is novel and highly worth documenting. [See "Control Flow Differentiation" slides](https://drive.google.com/corp/drive/folders/1y1FeJenXhoz_8xPw0ftVPngJUO_MdmRX) for an overview.
 
-- Original functions may have instructions other than `apply`. This includes the entire SIL [instruction set](https://github.com/apple/swift/blob/master/docs/SIL.rst#instruction-set):
+- Original functions may have instructions other than `apply`. This includes the entire SIL [instruction set](SIL.rst#instruction-set):
     - Memory-related operations: `alloc_stack`, `dealloc_stack`, `load`, `store`, etc.
     - Aggregate operations: `struct`, `tuple`, `enum`.
     - Projections: `struct_extract`, `tuple_extract`, `struct_element_addr`, `tuple_element_addr`.