More consistent spelling in 10_fibonacci

Co-authored-by: Alex Younger <61510135+fortypercenttitanium@users.noreply.github.com>

Author: jamienorthman

10_fibonacci/fibonacci.spec.js

@@ -16,7 +16,7 @@ describe('fibonacci', () => {
   test.skip('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
-  test.skip('0th fibonacci number is o', () => {
+  test.skip('0th fibonacci number is 0', () => {
     expect(fibonacci(0)).toBe(0);
   });
   test.skip('doesn\'t accept negatives', () => {