docs: Update Renode doc

* Update resource file path in the example
* Add opcode statistics information

Change-Id: I4b4e40191ffa285279cf9b876ab0587f6897aa3a

RenodeUsageNotes.md

diff --git a/RenodeUsageNotes.md b/RenodeUsageNotes.md
index de99340..8ff9d7a 100644
--- a/RenodeUsageNotes.md
+++ b/RenodeUsageNotes.md
@@ -7,7 +7,7 @@
 To streamline firing-up renode, use the `-e` flag to execute onload:
 
 ```
-renode "i @sim/config/shodan_hellovector.resc; start"
+renode "i @sim/config/shodan.resc; start"
 ```
 
 This will start the renode script (resc) automatically.
@@ -24,7 +24,7 @@
 
 This can be combined with the `-e` flag:
 ```
-renode --disable-xwt --port 1234 -e "i @sim/config/shodan_hellovector.resc; start"
+renode --disable-xwt --port 1234 -e "i @sim/config/shodan.resc; start"
 ```
 
 In a separate terminal window (or tmux pane), start a telnet at that port for
@@ -39,9 +39,9 @@
 Trying 127.0.0.1...
 Connected to 127.0.0.1.
 Escape character is '^]'.
-Renode, version 1.10.1.31213 (773406ba-202011051557)
+Renode, version 1.12.0.15824 (acb8f5b5-202201050847)
 
-(monitor) i @sim/config/shodan_hellovector.resc
+(monitor) i @sim/config/shodan.resc
 (machine-0)  start
 Starting emulation...
 (machine-0)
@@ -58,3 +58,30 @@
 ```
 
 This will quickly exit both telnet and the renode process on this port.
+
+## Opcode statistics and trace
+
+Renode allows the user to collect opcode statistics during execution.
+The function is defined [here](https://github.com/renode/renode-infrastructure/blob/master/src/Emulator/Cores/RiscV/RiscvOpcodesParser.cs).
+
+Some typical usages:
+
+* `cpu EnableRiscvOpcodesCounting`: with no parameters -- it'll take
+  instruction set extensions for the CPU as defined in the repl file and
+  enable opcodes counting for all of them
+
+  * It is enabled by default in `sim/config/springbok.resc`.
+  * "cpu" can be changed to the cpu variable with the stats enabled. For
+    example, in `sim/config/springbok.resc` it is `sysbus.cpu2`.
+* `cpu EnableRiscvOpcodesCountingFromEmbeddedResource <extension>`: Using the
+    riscv-opcodes files embedded into Renode. The list of available resources
+    can be retrieved with:
+
+```bash
+cpu GetRiscvOpcodesEmbeddedResourceNames
+```
+
+* `cpu GetAllOpcodesCounters`: Return a nicely formatted table to be printed
+  out in Renode.
+* `cpu SaveAllOpcodesCounters @path/to/file`: Dump counter data to a file.
+* `cpu ResetOpcodesCounters`: Reset all counters to 0