Minor fixes in 1990/jaw

Add missing bugs and (mis)features to README.md.

Typo fix in manifest.

Rebuilt .entry.json and index.html.

1990/jaw/.entry.json

@@ -49,7 +49,7 @@
 	    "OK_to_edit" : true,
 	    "display_as" : "ruby",
 	    "display_via_github" : true,
-	    "entry_text" : "bota utility"
+	    "entry_text" : "btoa utility"
 	},
 	{
 	    "file_path" : "shark.sh",