performance: Update based on ARC review

- Fix rate_limit to transition_latency
- Add more description for PERF_SET_LIMIT

#79 (comment)

Signed-off-by: Ley Foon Tan <[email protected]>

src/srvgrp-performance.adoc

@@ -463,7 +463,7 @@ loop:
 	for (i = 0; i < list.returned; i++, num++) {
 		opp[num].freq = list.entry[entry_num++];
 		opp[num].power = list.entry[entry_num++];
-		opp[num].rate_limit = list.entry[entry_num++];
+		opp[num].transition_latency = list.entry[entry_num++];
 	}
 
 	/* Check if there are remaining OPP to be read */
@@ -734,7 +734,15 @@ performance domain in the system.
 
 ==== Service: PERF_SET_LIMIT (SERVICE_ID: 0x08)
 This service is used to set the performance limit of a specific
-performance domain in the system.
+performance domain in the system. Any subsequent calls to `PERF_SET_LEVEL`
+will ensure the requested performance level stays within the defined range.
+
+If the current performance level falls outside the newly defined minimum and
+maximum range, the platform microcontroller firmware will automatically adjust
+it to comply with the updated limits. If notifications are enabled, the
+platform microcontroller firmware will send an appropriate notification
+(e.g., `PERF_LEVEL_CHANGE`, `PERF_POWER_CHANGE`, etc.) to the
+application processor.
 
 [#table_perf_setlimit_request_data]
 .Request Data