chore: fix typo in README.md

Signed-off-by: reddaisyy <[email protected]>

Author: reddaisyy

README.md

@@ -324,7 +324,7 @@ docker run -p 15888:15888 \
   hummingbot/gateway:core-2.8
 ```
 
-**Production mode (Encypted HTTPS endpoints, requires Hummingbot certs):**
+**Production mode (Encrypted HTTPS endpoints, requires Hummingbot certs):**
 ```bash
 docker run -p 15888:15888 \
   -e GATEWAY_PASSPHRASE=a \