capitalize the first letter of some print

[shenxianpeng]

I used https://github.com/cpp-linter/cpp-linter-hooks and found the clang-tools output format output is inconsistent.

I would suggest capitalizing the first letter. e.g change downloading to Downloading

$ pre-commit run --all-files
clang-format.............................................................Failed
- hook id: clang-format
- exit code: 1

downloading clang-format (version 13)
Installing clang-format-13 to /home/xshen/.cache/pre-commit/repol6kggrfo/py_env-python3.11/bin
[Errno 2] No such file or directory: '/home/xshen/.cache/pre-commit/repol6kggrfo/py_env-python3.11/bin/clang-format'

clang-tidy...............................................................Failed
- hook id: clang-tidy
- exit code: 1

downloading clang-tidy (version 13)
Installing clang-tidy-13 to /home/xshen/.cache/pre-commit/repol6kggrfo/py_env-python3.11/bin
[Errno 2] No such file or directory: '/home/xshen/.cache/pre-commit/repol6kggrfo/py_env-python3.11/bin/clang-tidy'