util: drop write_content_size=True
This is now the default in python-zstandard 0.9. While we're here,
also add a comment about the ability to drop frame magic to save
space.
Differential Revision: https://phab.mercurial-scm.org/D3199
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true