Spelling error in CONTRIBUTIONS.md

Author: NikolasKomonen

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 Contributions are essential for keeping this extension great.
 We try to keep it as easy as possible to contribute changes and we are
-open to suggesstions for making it even easier.
+open to suggestions for making it even easier.
 There are only a few guidelines that we need contributors to follow.
 
 ## vscode-java vs eclipse.jdt.ls