Fix typos in comments detected by the misspell tool

Author: TysonAndre

src/Indexer.php

@@ -96,7 +96,7 @@ public function __construct(
     }
 
     /**
-     * Will read and parse the passed source files in the project and add them to the appropiate indexes
+     * Will read and parse the passed source files in the project and add them to the appropriate indexes
      *
      * @return Promise <void>
      */

src/Protocol/DocumentHighlightKind.php

@@ -8,7 +8,7 @@
 abstract class DocumentHighlightKind
 {
     /**
-     * A textual occurrance.
+     * A textual occurrence.
      */
     const TEXT = 1;