Update links to external documents.

Fix a typo in LLVM IR example.

Author: bader

llvm-spirv/docs/SPIRVRepresentationInLLVM.rst

@@ -8,7 +8,7 @@ Overview
 ========
 
 As one of the goals of SPIR-V is to `"map easily to other IRs, including LLVM
-IR" <https://cvs.khronos.org/svn/repos/SPIRV/trunk/specs/SPIRV.html#_goals>`_,
+IR" <https://www.khronos.org/registry/spir-v/specs/unified1/SPIRV.html#_goals>`_,
 most of SPIR-V entities (global variables, constants, types, functions, basic
 blocks, instructions) have straightforward counterparts in LLVM. Therefore the
 focus of this document is those entities in SPIR-V which do not map to LLVM in
@@ -81,7 +81,7 @@ Some SPIR-V instructions which can be included in basic blocks do not have
 corresponding LLVM instructions or intrinsics. These SPIR-V instructions are
 represented by function calls in LLVM. The function corresponding to a SPIR-V
 instruction is termed SPIR-V builtin function and its name is `IA64 mangled
-<https://mentorembedded.github.io/cxx-abi/abi.html#mangling>`_ with extensions
+<https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling>`_ with extensions
 for SPIR-V specific types. The unmangled name of a SPIR-V builtin function
 follows the convention
 
@@ -209,7 +209,7 @@ following format:
 
 .. code-block:: llvm
 
-  !spirv.<OpCodeName> = !{!<InstructionMetadata1>, <InstructionMetadata2>, ..}
+  !spirv.<OpCodeName> = !{!<InstructionMetadata1>, !<InstructionMetadata2>, ..}
   !<InstructionMetadata1> = !{<Operand1>, <Operand2>, ..}
   !<InstructionMetadata2> = !{<Operand1>, <Operand2>, ..}