Fix typo

docs/src/rust_settings.md

@@ -69,7 +69,7 @@ Note that this setting is actually called `clippy.toml`.
 The default value for `--codegen-units` which also affects resource allocation for rustc actions.
 
 Note that any value 0 or less will prevent this flag from being passed by Bazel and allow rustc to
-perform it's default behavior.
+perform its default behavior.
 
 https://doc.rust-lang.org/rustc/codegen-options/index.html#codegen-units