[SYCLomatic][NFC] Fix a value typo for "--migrate-build-script" in mi…

…gration examples (oneapi-src#2125)

Signed-off-by: chenwei.sun <[email protected]>

llvm/include/llvm/migration_cmd_examples.inc

@@ -45,7 +45,7 @@ R"(
       $ dpct -in-root=/path/to/project --in-root-exclude=/path/to/project/dir1                                    # Exclude migration of a dir or file
     
     Migrate/generate build scripts for migrated SYCL code
-      $ dpct --migrate-build-script=cmake -p=/path/to/compilation-database --in-root=/path/to/project --out-root=/path/to/migrated-project        # Migrate src code and CMake scripts
+      $ dpct --migrate-build-script=CMake -p=/path/to/compilation-database --in-root=/path/to/project --out-root=/path/to/migrated-project        # Migrate src code and CMake scripts
       $ dpct --migrate-build-script-only -p=/path/to/compilation-database --in-root=/path/to/project --out-root=/path/to/migrated-project         # Migrate build script only
       $ dpct --gen-build-script -p=/path/to/compilation-database --in-root=/path/to/project --out-root=/path/to/migrated-project                  # Migrate src code and generate Makefile script