Fix typo in completionResult variable name (#318)

Author: mylesmmurphy

src/example/sample.ts

@@ -49,8 +49,8 @@ async function main() {
      * > ]
      */
 
-    const competionResult = await jsonLanguageService.doComplete(textDocument, { line: 2, character: 18 }, jsonDocument);
-    console.log('Completion proposals:', competionResult?.items.map(i => `${i.label}`));
+    const completionResult = await jsonLanguageService.doComplete(textDocument, { line: 2, character: 18 }, jsonDocument);
+    console.log('Completion proposals:', completionResult?.items.map(i => `${i.label}`));
 
     /*
      * Completion proposals: [ '"Ireland"', '"Iceland"' ]