[CMake] Fix typo in docstring: telemtry -> telemetry (NFC)

Thanks Nikita for spotting it.

(cherry picked from commit 13ded68)

Author: JDevlieghere

llvm/CMakeLists.txt

@@ -829,7 +829,7 @@ option (LLVM_ENABLE_DOXYGEN "Use doxygen to generate llvm API documentation." OF
 option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
 option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
 option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
-option (LLVM_BUILD_TELEMETRY "Build the telemtry library. This does not enable telemetry." ON)
+option (LLVM_BUILD_TELEMETRY "Build the telemetry library. This does not enable telemetry." ON)
 
 set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/llvm/doxygen-html"
     CACHE STRING "Doxygen-generated HTML documentation install directory")