Documentation on database.fetch config is confusing

[Nemo157]

According to the config documentation

rustsec/cargo-audit/src/config.rs

Lines 128 to 129 in 329bf88

	/// Perform a `git fetch` before auditing (default: true)
	pub fetch: bool,

but the actual logic appears to be

rustsec/cargo-audit/src/cli_config.rs

Line 64 in 329bf88

config.database.fetch |= !self.no_fetch;

so setting fetch = false (which is the actual default) only means that --no-fetch will work, but it will still fetch it with default CLI commands; while setting fetch = true overrides --no-fetch and forces fetching the database always even if you try to stop it for one command.