Fix broken links in README

README.md

@@ -50,8 +50,8 @@ including installing pre-releases.
 - [Installing Helm](docs/install.md)
 - [Using Helm](docs/using_helm.md)
 - [Developing Charts](docs/charts.md)
-	- [Chart Lifecycle Hooks](docs/chart_hooks.md)
-	- [Chart Tips and Tricks](docs/chart_tips_and_tricks.md)
+	- [Chart Lifecycle Hooks](docs/charts_hooks.md)
+	- [Chart Tips and Tricks](docs/charts_tips_and_tricks.md)
 	- [Chart Repository Guide](docs/chart_repository.md)
 	- [Syncing your Chart Repository](docs/chart_repository_sync_example.md)
 	- [Signing Charts](docs/provenance.md)