docs: Describe when and why to use init: false (#1263)

Author: Mr0grog

README.md

@@ -196,7 +196,8 @@ const repo = <IPFS Repo instance or repo path>
 const node = new IPFS({
   repo: repo,
   init: true, // default
-  // init: false,
+  // init: false, // You will need to set init: false after time you start instantiate a node as
+  //              // the repo will be already initiated then.
   // init: {
   //   bits: 1024 // size of the RSA key generated
   // },