fix typo in references.bib

Author: Andy Barrett

nsidc-data-cookbook/references.bib

@@ -1,6 +1,6 @@
 
 @misc{wikipedia_latitude_2023,
-        author = {Wikipedia}
+        author = {Wikipedia},
 	title = {Latitude},
 	copyright = {Creative Commons Attribution-ShareAlike License},
 	url = {https://en.wikipedia.org/w/index.php?title=Latitude&oldid=1142356301},