Fix comment spelling

Author: interfect

README.md

@@ -192,7 +192,7 @@ const IPFS = typeof Ipfs !== 'undefined' ? Ipfs  // browser global
 // Make an IPFS node
 var ipfs = new IPFS()
 
-// Init a repo in the given IPFS node it if hasn't got one already. Calsl the
+// Init a repo in the given IPFS node it if hasn't got one already. Calls the
 // setup callback, passing the normal callback, after first initialization.
 // Calls the normal callback directly after subsequent initializations. Calls
 // the normal callback with an error parameter if there is an error.