Fix example variable naming for consistency

Author: h2zero

examples/NimBLE_Client/NimBLE_Client.ino

@@ -34,8 +34,8 @@ class ClientCallbacks : public NimBLEClientCallbacks {
         NimBLEDevice::injectPassKey(connInfo, 123456);
     }
 
-    void onConfirmPasskey(NimBLEConnInfo& connInfo, uint32_t pass_key) override {
-        Serial.printf("The passkey YES/NO number: %" PRIu32 "\n", pass_key);
+    void onConfirmPasskey(NimBLEConnInfo& connInfo, uint32_t passkey) override {
+        Serial.printf("The passkey YES/NO number: %" PRIu32 "\n", passkey);
         /** Inject false if passkeys don't match. */
         NimBLEDevice::injectConfirmPasskey(connInfo, true);
     }

examples/NimBLE_Server/NimBLE_Server.ino

@@ -49,8 +49,8 @@ class ServerCallbacks : public NimBLEServerCallbacks {
         return 123456;
     }
 
-    void onConfirmPassKey(NimBLEConnInfo& connInfo, uint32_t pass_key) override {
-        Serial.printf("The passkey YES/NO number: %" PRIu32 "\n", pass_key);
+    void onConfirmPassKey(NimBLEConnInfo& connInfo, uint32_t passkey) override {
+        Serial.printf("The passkey YES/NO number: %" PRIu32 "\n", passkey);
         /** Inject false if passkeys don't match. */
         NimBLEDevice::injectConfirmPasskey(connInfo, true);
     }