docs(dotnet): update logs docs to .NET SDK v6 (#16055)

Co-authored-by: James Crosswell <jamescrosswell@users.noreply.github.com>

Author: Flash0ver

platform-includes/logs/options/dotnet.mdx

@@ -44,7 +44,7 @@ options =>
 });
 ```
 
-The callback function set via `SetBeforeSendLog(Func<SentryLog, SentryLog?>)` receives a log object, and should return the log object if you want it to be sent to Sentry, or `null` if you want to discard it.
+The `beforeSendLog` delegate receives a log object, and should return the log object if you want it to be sent to Sentry, or `null` if you want to discard it.
 
 The log object of type `SentryLog` has the following members:
 - `Timestamp` Property: (`DateTimeOffset`) The timestamp of the log.
@@ -53,6 +53,6 @@ The log object of type `SentryLog` has the following members:
 - `Message` Property: (`string`) The formatted log message.
 - `Template` Property: (`string?`) The parameterized template string.
 - `Parameters` Property: (`ImmutableArray<KeyValuePair<string, object>>`) The parameters to the template string.
-- `ParentSpanId` Property: (`SpanId?`) The span id of the span that was active when the log was collected.
+- `SpanId` Property: (`SpanId?`) The span id of the span that was active when the log was collected.
 - `TryGetAttribute(string key, out object value)` Method: Gets the attribute value associated with the specified key. Returns `true` if the log contains an attribute with the specified key and it's value is not `null`, otherwise `false`.
 - `SetAttribute(string key, object value)` Method: Sets a key-value pair of data attached to the log. Supported types are `string`, `bool`, integers up to a size of 64-bit signed, and floating-point numbers up to a size of 64-bit.

platform-includes/logs/usage/dotnet.mdx

@@ -2,7 +2,7 @@
 
 Once the feature is enabled on the SDK and the SDK is initialized, you can send logs using the `SentrySdk.Logger` APIs.
 
-The `SentrySdk.Logger` instance exposes six methods that you can use to log messages at different log levels: `Trace`, `Debug`, `Info`, `Warning`, `Error`, and `Fatal`.
+The `SentryStructuredLogger` type exposes six method groups that you can use to log messages at different log levels: `Trace`, `Debug`, `Info`, `Warning`, `Error`, and `Fatal`.
 
 These properties will be sent to Sentry, and can be searched from within the Logs UI, and even added to the Logs views as a dedicated column.