manage_sql.py: sql_checkconn() rename (last n missing) and description correction

manage_sql.py

@@ -37,8 +37,8 @@ class HandleSql:
     """Class to handle sql connection."""
 
     @staticmethod
-    def sql_checkcon():
-        """Init sql connection."""
+    def sql_checkconn():
+        """Check MySQL connection."""
         try:
             global conn
             conn = pymysql.connect(host=SQL_HOST, db=SQL_DB, user=SQL_USER, passwd=SQL_PWD)