Update libc/CMakeLists.txt

Co-authored-by: Michael Jones <[email protected]>

Author: saturn691

libc/CMakeLists.txt

@@ -135,7 +135,7 @@ endif()
 option(LLVM_LIBC_FULL_BUILD "Build and test LLVM libc as if it is the full libc" ${default_to_full_build})
 option(LLVM_LIBC_IMPLEMENTATION_DEFINED_TEST_BEHAVIOR "Build LLVM libc tests assuming our implementation-defined behavior" ON)
 option(LLVM_LIBC_ENABLE_LINTING "Enables linting of libc source files" OFF)
-option(LLVM_LIBC_ALL_HEADERS "Outputs all functions in header files, regardless of whether it has been implemented" OFF)
+option(LLVM_LIBC_ALL_HEADERS "Outputs all functions in header files, regardless of whether they are enabled on this target" OFF)
 
 option(LIBC_CONFIG_PATH "The path to user provided folder that configures the build for the target system." OFF)