doc: fix typo in errors.md

PR-URL: #43677
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Qingyu Deng <i@ayase-lab.com>

doc/api/errors.md

@@ -2389,7 +2389,7 @@ value is provided for an option of type {boolean}.
 added: v18.3.0
 -->
 
-Thrown by [`util.parseArgs()`][], when a postional argument is provided and
+Thrown by [`util.parseArgs()`][], when a positional argument is provided and
 `allowPositionals` is set to `false`.
 
 <a id="ERR_PARSE_ARGS_UNKNOWN_OPTION"></a>
@@ -2690,7 +2690,7 @@ added:
  - v12.17.0
 -->
 
-The TLS socket must be connected and securily established. Ensure the 'secure'
+The TLS socket must be connected and securely established. Ensure the 'secure'
 event is emitted before continuing.
 
 <a id="ERR_TLS_PROTOCOL_VERSION_CONFLICT"></a>