docs: add RequestTimeoutMillis option to .NET SDK initialization docs (#696)

Author: sameerank

docs/sdks/server-sdks/dotnet/initialization.mdx

@@ -57,6 +57,15 @@ The interval in milliseconds between polling attempts to fetch updated configura
 The maximum amount of time in milliseconds to add to the polling interval.
 </ApiOptionRef>
 
+<ApiOptionRef 
+  name="RequestTimeoutMillis"
+  type="number"
+  defaultValue="1000"
+>
+
+**Timeout** in milliseconds for HTTPS requests for the experiment configurations.
+</ApiOptionRef>
+
 <ApiOptionRef 
   name="AssignmentLogger"
   type="IAssignmentLogger"
@@ -127,4 +136,4 @@ catch (EppoInitializationException ex)
 
 3. **Configure Timeouts**: Set appropriate timeout values for your use case to prevent hanging operations.
 
-4. **Monitor Memory**: Be mindful of memory usage when setting polling intervals, as configurations are cached in memory.
+4. **Monitor Memory**: Be mindful of memory usage when setting polling intervals, as configurations are cached in memory.