Fix a couple issues

Author: krollins-mdb

source/includes/api-details/cpp/logger/logging-customize-logger-description.rst

@@ -1,3 +1,6 @@
 To set a custom logger function with the C++ SDK, create a 
 :cpp-sdk:`realm::logger <structrealm_1_1logger.html#a1c4a96ab2eb5e6b164f17552c233104a>`
 and override the virtual ``do_log()`` member function.
+
+.. literalinclude:: /examples/generated/cpp/logger.snippet.create-custom-logger.cpp
+  :language: cpp

source/includes/sdk-examples/logger/logging-set-custom-logger-example.rst

@@ -10,9 +10,8 @@
      - id: csharp
        content: |
 
-         .. literalinclude:: /examples/MissingPlaceholders/example.cs
+         .. literalinclude:: /examples/generated/dotnet/ErrorHandler.snippet.customize-logging-function.cs
             :language: csharp
-            :copyable: false
 
      - id: dart
        content: |
@@ -45,3 +44,4 @@
          .. literalinclude:: /examples/generated/node/v12/logger.test.snippet.set-custom-logger.ts
             :language: typescript
             :copyable: false
+