Update docs

CHANGELOG.md

@@ -15,6 +15,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added `no-exclude` cli flag to disable excludes.
 - When given in standard library format, additional information now shows up in `incorrect_standard_library_use` missing required parameter errors.
 - Added new [`mixed_table` lint](https://kampfkarren.github.io/selene/lints/mixed_table.html), which will warn against mixed tables.
+- Added new [`fix`](https://kampfkarren.github.io/selene/cli/usage.html#fix) flag, which will automatically apply lint suggestions.
 
 ### Fixed
 - `string.pack` and `string.unpack` now have proper function signatures in the Lua 5.3 standard library.

docs/src/cli/usage.md

@@ -77,6 +77,10 @@ Results:
 0 parse errors
 ```
 
+**--fix** *fix*
+
+Automatically applies lint suggestions. Because this can be potentially destructive, it's not allowed by default when there are uncommitted changes. This safety can be ignored by including `--allow-dirty` to allow with unstaged changes or `--allow-staged` to allow only staged changes.
+
 **--num-threads** *num-threads*
 
 Specifies the number of threads for selene to use. Defaults to however many cores your CPU has. If you type `selene --help`, you can see this number because it will show as the default for you.

selene-lib/src/lints/unused_variable.rs

@@ -174,7 +174,7 @@ impl Lint for UnusedVariableLint {
 
                 // Applying fix would cause existing references to reference a nonexistent variable. It's possible to
                 // also rename those references as well, but we'd need to check each of their scopes for potentially
-                // colliding variables. Cargo just doesn't apply a fix at all in these cases.
+                // colliding variables. Clippy just doesn't apply a fix at all in these cases.
                 if variable.references.iter().any(|reference| {
                     ast_context.scope_manager.references[*reference]
                         .identifier