Documentation: dwc_pcie_pmu: Fix the mnemonics and eventid

Fix the event id and type in the example. In addition, the recent fix,
which addressed the mnemonics with mixed case, didn't fix the document.
Match the names with the driver.

Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241205061914.5568-3-ilkka@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: ilkka-koskinen

Documentation/admin-guide/perf/dwc_pcie_pmu.rst

@@ -60,7 +60,7 @@ description of available events and configuration options in sysfs, see
 The "format" directory describes format of the config fields of the
 perf_event_attr structure. The "events" directory provides configuration
 templates for all documented events.  For example,
-"Rx_PCIe_TLP_Data_Payload" is an equivalent of "eventid=0x22,type=0x1".
+"rx_pcie_tlp_data_payload" is an equivalent of "eventid=0x21,type=0x0".
 
 The "perf list" command shall list the available events from sysfs, e.g.::
 
@@ -79,8 +79,8 @@ Example usage of counting PCIe RX TLP data payload (Units of bytes)::
 
 The average RX/TX bandwidth can be calculated using the following formula:
 
-    PCIe RX Bandwidth = Rx_PCIe_TLP_Data_Payload / Measure_Time_Window
-    PCIe TX Bandwidth = Tx_PCIe_TLP_Data_Payload / Measure_Time_Window
+    PCIe RX Bandwidth = rx_pcie_tlp_data_payload / Measure_Time_Window
+    PCIe TX Bandwidth = tx_pcie_tlp_data_payload / Measure_Time_Window
 
 Lane Event Usage
 -------------------------------