[chore][docs] Fix name of the Windows Event Log Receiver (#33295)

**Description:** <Describe what has changed.>
Changing "Windows Log Event Receiver" to "Windows Event Log Receiver" as
that is the official name. IBM docs is also linking out to this readme
so we need consistency.

https://www.ibm.com/docs/en/instana-observability/current?topic=opentelemetry-sending-data-instana-agent#enabling-tls-encryption-for-opentelemetry-ingestion

receiver/windowseventlogreceiver/README.md

@@ -1,4 +1,4 @@
-## Windows Log Event Receiver
+## Windows Event Log Receiver
 
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