docs fix spelling issues (#862)

* Update WALKTHROUGH.md

* Update accounts.md

* Update config-lnd-integrated.md

* Update WALKTHROUGH.md

* Update accounts.md

* Update config-lnd-integrated.md

docs/WALKTHROUGH.md

@@ -141,7 +141,7 @@ submitted.
     swap id, amount, and current status as a progress bar.
 
     Swaps require on-chain transactions, so you will need to wait for confirmations before
-    they will complete successfully. For more detailed information about the swap process,
+    they will completed successfully. For more detailed information about the swap process,
     take a look at the
     [Loop Out In-depth](https://lightning.engineering/posts/2019-04-15-loop-out-in-depth/)
     blog post.

docs/accounts.md

@@ -15,12 +15,12 @@ amount of the node's channel balance.
 NOTE: An account's balance is purely virtual. If an account is created with an
 initial balance higher than the node's actual overall channel balance, that is
 equivalent to fractional reserve banking. Therefore, the user accepting an
-account restricted access enters a trust relationship with the node operator
+account-restricted access enters a trust relationship with the node operator
 that the promised balance of the account is actually spendable.
 
 ## How do accounts work?
 
-The accounts systems is made possible thanks to the power of
+The accounts system is made possible thanks to the power of
 [macaroons](https://github.com/lightningnetwork/lnd/blob/master/docs/macaroons.md)
 and the [RPC middleware
 interceptor](https://github.com/lightningnetwork/lnd/blob/master/lnrpc/lightning.proto#L558)

docs/config-lnd-integrated.md

@@ -310,7 +310,7 @@ as it is the default directory (`~/.lnd` on Linux).
 
 ### Example `loop` command
 
-This is where things get a bit tricky. Because as mentioned above, `loopd` also
+This is where things get a bit tricky, because as mentioned above, `loopd` also
 runs on the same gRPC server as `lnd`. That's why we have to both specify the
 `host:port` as well as the TLS certificate of `lnd`. But `loopd` verifies its
 own macaroon, so we have to specify that one from the `.loop` directory.