Merge #17351: doc: Fix some misspellings

ac831339cb doc: Fix some misspellings (randymcmillan)

Pull request description:

  Here is a more thorough lint-spelling update.
  This PR takes care of easy to fix spelling errors to clean up the linting stages.
  There are misspellings coded into the functional tests.
  That is a whole separate job within itself.

ACKs for top commit:
  practicalswift:
    ACK ac831339cb -- diff looks correct

Tree-SHA512: d8fad83fed083715655f148263ddeffc6752c8007d568fcf3dc2c418ccd5db70089ce3ccfd3994fcbd78043171402eb9cca5bdd5125287e22c42ea305aaa6e9d

src/qt/bitcoin.cpp

@@ -309,7 +309,7 @@ void BitcoinApplication::requestShutdown()
     // rescanning a wallet.
     m_node.startShutdown();
     // Unsetting the client model can cause the current thread to wait for node
-    // to complete an operation, like wait for a RPC execution to complate.
+    // to complete an operation, like wait for a RPC execution to complete.
     window->setClientModel(nullptr);
     pollShutdownTimer->stop();