Fix typo in error name and rename for consistency.

Author: anthony-tuininga

src/oracledb/errors.py

@@ -312,7 +312,7 @@ def _raise_err(
 ERR_UNEXPECTED_END_OF_DATA = 5006
 ERR_UNEXPECTED_XML_TYPE = 5007
 ERR_TOO_MANY_CURSORS_TO_CLOSE = 5008
-ERR_UNKOWN_SERVER_SIDE_PIGGYBACK = 5009
+ERR_UNKNOWN_SERVER_PIGGYBACK = 5009
 
 # error numbers that result in OperationalError
 ERR_LISTENER_REFUSED_CONNECTION = 6000
@@ -684,7 +684,7 @@ def _raise_err(
         "format was returned"
     ),
     ERR_UNEXPECTED_XML_TYPE: "unexpected XMLType with flag {flag}",
-    ERR_UNKOWN_SERVER_SIDE_PIGGYBACK: (
+    ERR_UNKNOWN_SERVER_PIGGYBACK: (
         "internal error: unknown server side piggyback opcode {opcode}"
     ),
     ERR_UNSUPPORTED_INBAND_NOTIFICATION: (

src/oracledb/impl/thin/messages.pyx

@@ -264,7 +264,7 @@ cdef class Message:
             buf.skip_ub4()                  # session id
             buf.skip_ub2()                  # serial number
         else:
-            errors._raise_err(errors.ERR_UNKOWN_SERVER_SIDE_PIGGYBACK,
+            errors._raise_err(errors.ERR_UNKNOWN_SERVER_PIGGYBACK,
                               opcode=opcode)
 
     cdef int _process_warning_info(self, ReadBuffer buf) except -1: