Fix typos

This commit fixes the following typos:

```console
$ bundle exec rake
git ls-files --empty-directory | xargs codespell
README.md:87: complies ==> compiles
docs/modules/ROOT/pages/cops_performance.adoc:1274: falsy ==> falsely, false
lib/rubocop/cop/performance/map_compact.rb:13: falsy ==> falsely, false
```

Author: koic

README.md

@@ -84,7 +84,7 @@ You can read a lot more about RuboCop Performance in its [official docs](https:/
 
 ## Compatibility
 
-RuboCop Performance complies with the RuboCop core compatibility.
+RuboCop Performance is compatible with RuboCop core.
 
 See the [compatibility documentation](https://docs.rubocop.org/rubocop/compatibility.html) for further details.
 

docs/modules/ROOT/pages/cops_performance.adoc

@@ -1271,7 +1271,7 @@ This cop identifies places where `map { ... }.compact` can be replaced by `filte
 
 This cop's autocorrection is unsafe because `map { ... }.compact` might yield
 different results than `filter_map`. As illustrated in the example, `filter_map`
-also filters out falsy values, while `compact` only gets rid of `nil`.
+also filters out falsey values, while `compact` only gets rid of `nil`.
 
 [#examples-performancemapcompact]
 === Examples

lib/rubocop/cop/performance/map_compact.rb

@@ -10,7 +10,7 @@ module Performance
       # @safety
       #   This cop is unsafe because `map { ... }.compact` might yield
       #   different results than `filter_map`. As illustrated in the example, `filter_map`
-      #   also filters out falsy values, while `compact` only gets rid of `nil`.
+      #   also filters out falsey values, while `compact` only gets rid of `nil`.
       #
       # [source,ruby]
       # ----