Remove a potentially misleading docstring paragraph

That was just added in the previous commit.

`installation_config()` and `installation_config_prefix()` should
never use, as their only strategy, the technique implemented in the
newly introduced `git_for_windows_root()` helper, because if the
system-scope configuration file is present elsewhere, including
due to `GIT_CONFIG_SYSTEM` being set, then that *should* affect the
values returned by those functions (except on Apple Git and any
other systems where a separate higher "unknown" scope exists and is
typically nonempty).

Rather, some uses of `installation_config_prefix()`, such as to
find other files that are better looked for relative to installed
non-configuration files or installation directory itself rather
than relative to its configuration file, might in the future be
suitable to look fo9r using `git_for_windows_root()`.

Author: EliahKagan

gix-path/src/env/auxiliary.rs

@@ -44,16 +44,7 @@ const MSYS_USR_VARIANTS: &[&str] = &["mingw64", "mingw32", "clangarm64", "clang6
 /// Find a Git for Windows installation directory based on `git --exec-path` output.
 ///
 /// Currently this is used only for finding the path to an `sh.exe` associated with Git. This is
-/// separate from `installation_config()` and `installation_config_prefix()` in `gix_path::env`,
-/// which guess where `etc/gitconfig` is based on `EXEPATH` or the location of the highest-scope
-/// config file.
-///
-/// The techniques might be combined or unified in some way in the future. The techniques those
-/// functions currently use shouldn't be used to find `sh.exe`, because `EXEPATH` can take on other
-/// values in some environments, and the highest scope config file may be unavailable or in another
-/// location if `GIT_CONFIG_SYSTEM` or `GIT_CONFIG_NOSYSTEM` are set or if there are no variables
-/// of system scope. Then paths found relative to it could be different. In contrast, the technique
-/// used here may be usable for those functions, though may need to cover more directory layouts.
+/// separate from `installation_config()` and `installation_config_prefix()` in `gix_path::env`.
 fn git_for_windows_root() -> Option<&'static Path> {
     static GIT_ROOT: Lazy<Option<PathBuf>> = Lazy::new(|| {
         super::core_dir()