fix: doc generation struct slice example value

[zl03jsj]

as you can see, all slice type example value is null in document:

lotus/documentation/en/api-v1-unstable-methods.md

Lines 616 to 651 in 921fda9

	### ChainGetParentMessages
	ChainGetParentMessages returns messages stored in parent tipset of the
	specified block.
	Perms: read
	Inputs:
	```json
	[
	{
	"/": "bafy2bzacea3wsdh6y3a36tb3skempjoxqpuyompjbmfeyf34fi3uy6uue42v4"
	}
	]
	```
	Response: `null`
	### ChainGetParentReceipts
	ChainGetParentReceipts returns receipts for messages in parent tipset of
	the specified block. The receipts in the list returned is one-to-one with the
	messages returned by a call to ChainGetParentMessages with the same blockCid.
	Perms: read
	Inputs:
	```json
	[
	{
	"/": "bafy2bzacea3wsdh6y3a36tb3skempjoxqpuyompjbmfeyf34fi3uy6uue42v4"
	}
	]
	```
	Response: `null`

fix: ExampleValue for a slice would be nil

add json.RawMessage ExampleValue.

the AlertEvent.Message needs a json.RawMessage example value, or would panic with json.MarshalJSON error.

lotus/journal/alerting/alerts.go

Lines 32 to 36 in 921fda9

	type AlertEvent struct {
	Type string // either 'raised' or 'resolved'
	Message json.RawMessage
	Time time.Time
	}

[magik6k]

Thanks!

(Needs make docsgen to regenerate openrpc blobs)

[zl03jsj]

make docsgen

done

[codecov]

Codecov Report

Merging #7851 (4172a3c) into master (9b11c4b) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7851      +/-   ##
==========================================
- Coverage   39.45%   39.41%   -0.04%     
==========================================
  Files         654      654              
  Lines       70171    70171              
==========================================
- Hits        27684    27659      -25     
- Misses      37734    37750      +16     
- Partials     4753     4762       +9     

Impacted Files	Coverage Δ
chain/stmgr/call.go	67.87% <0.00%> (-7.28%)	⬇️
markets/retrievaladapter/client_blockstore.go	62.50% <0.00%> (-6.25%)	⬇️
chain/messagepool/repub.go	51.61% <0.00%> (-4.31%)	⬇️
extern/sector-storage/sched.go	83.12% <0.00%> (-1.65%)	⬇️
miner/miner.go	55.29% <0.00%> (-1.33%)	⬇️
chain/stmgr/searchwait.go	66.02% <0.00%> (-1.29%)	⬇️
extern/storage-sealing/fsm.go	55.77% <0.00%> (-1.20%)	⬇️
chain/vm/vm.go	61.76% <0.00%> (-1.07%)	⬇️
chain/sync_manager.go	66.77% <0.00%> (-0.63%)	⬇️
extern/sector-storage/sched_worker.go	78.48% <0.00%> (-0.59%)	⬇️
... and 8 more

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[magik6k]

thanks!