Make sentry.message.parameter singular matching otel conventions

Author: AbhiPrasad

develop-docs/sdk/telemetry/logs.mdx

@@ -267,7 +267,7 @@ The internal SDK implementation is kept purposefully broad as we are still in ea
 By default the SDK should set the following attributes:
 
 1. `sentry.message.template`: The parameterized template string
-2. `sentry.message.parameters.X`: The parameters to the template string, where X is the number that represent the parameters position in the template string
+2. `sentry.message.parameter.X`: The parameters to the template string, where X is the number that represent the parameters position in the template string
 3. `sentry.environment`: The environment set in the SDK
 4. `sentry.release`: The release set in the SDK
 5. `sentry.trace.parent_span_id`: The span id of the span that was active when the log was collected. This should not be set if there was no active span.
@@ -277,8 +277,8 @@ Example:
 ```json
 {
   "sentry.message.template": "Adding item %s for user %s",
-  "sentry.message.parameters.0": "item_id",
-  "sentry.message.parameters.1": "user_id",
+  "sentry.message.parameter.0": "item_id",
+  "sentry.message.parameter.1": "user_id",
   "sentry.environment": "production",
   "sentry.release": "1.0.0",
   "sentry.trace.parent_span_id": "b0e6f15b45c36b12"