ZJIT: Fix erroneous version number for Iongraph (ruby#15357)

As per
https://github.com/mozilla-spidermonkey/iongraph/blob/8d5e531305320216f86a24bfc9bc136a3627e832/src/iongraph.ts#L147,
correct version number for the web-based tool is 1, rather than 2.

Author: aidenfoxivey

doc/jit/zjit.md

@@ -166,7 +166,7 @@ stackprof path/to/zjit_exits_{pid}.dump
 
 Using `--zjit-dump-hir-iongraph` will dump all compiled functions into a directory named `/tmp/zjit-iongraph-{PROCESS_PID}`. Each file will be named `func_{ZJIT_FUNC_NAME}.json`. In order to use them in the Iongraph viewer, you'll need to use `jq` to collate them to a single file. An example invocation of `jq` is shown below for reference.
 
-`jq --slurp --null-input '.functions=inputs | .version=2' /tmp/zjit-iongraph-{PROCESS_PID}/func*.json > ~/Downloads/ion.json`
+`jq --slurp --null-input '.functions=inputs | .version=1' /tmp/zjit-iongraph-{PROCESS_PID}/func*.json > ~/Downloads/ion.json`
 
 From there, you can use https://mozilla-spidermonkey.github.io/iongraph/ to view your trace.