docs: Update cargo.md (#2680)

* Update cargo.md

Added information on how to install using cargo git with mise.

* Add lines around heading

docs/dev-tools/backends/cargo.md

@@ -40,6 +40,23 @@ The version will be set in `~/.config/mise/config.toml` with the following forma
 "cargo:eza" = "latest"
 ```
 
+### Using Git
+
+You can install a any package from a Git repository using the `mise` command. This allows you to install a particular tag, branch, or commit revision:
+
+```sh
+# Install a specific tag
+mise use cargo:github.com/username/demo@tag:<release_tag>
+
+# Install the latest from a branch
+mise use cargo:github.com/username/demo@branch:<branch_name>
+
+# Install a specific commit revision
+mise use cargo:github.com/username/demo@rev:<commit_hash>
+```
+
+This will execute a `cargo install` command with the corresponding Git options.
+
 ## Configuration
 
 Set these with `mise settings set [VARIABLE] [VALUE]` or by setting the environment variable listed.