Reformat to coding standard.

Author: github-actions[bot]

sql/plsql/PlSqlLexer.g4

@@ -2467,8 +2467,7 @@ REMARK_COMMENT:
 PROMPT_MESSAGE: 'PRO' {this.IsNewlineAtPos(-4)}? 'MPT'? (' ' ~('\r' | '\n')*)? NEWLINE_EOF;
 
 // TODO: should starts with newline
-START_CMD
-    : // https://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12002.htm
+START_CMD: // https://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12002.htm
     '@' '@'?
 ; // https://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12003.htm