Add "Remarks" and "Example" headings for error references in range [C2821, C2850]

Author: Rageking8

docs/error-messages/compiler-errors-2/compiler-error-c2821.md

@@ -10,6 +10,8 @@ ms.assetid: e8d71988-a968-4484-94db-e8c3bad74a4a
 
 > first formal parameter to 'operator new' must be 'unsigned int'
 
+## Remarks
+
 The first formal parameter of the [operator new](../../standard-library/new-operators.md#op_new) must be an unsigned **`int`**.
 
 ## Example

docs/error-messages/compiler-errors-2/compiler-error-c2823.md

@@ -10,6 +10,8 @@ ms.assetid: 982b1b35-1a7c-456e-b711-f80cfe2d571e
 
 > a typedef template is illegal
 
+## Remarks
+
 Templates are not allowed in **`typedef`** definitions.
 
 ## Example

docs/error-messages/compiler-errors-2/compiler-error-c2824.md

@@ -10,8 +10,12 @@ ms.assetid: 5bd865f7-e0af-404e-80fe-e2b798b44a59
 
 > return type for 'operator new' must be 'void *'
 
+## Remarks
+
 With non-based pointers, overloads of operator `new` must return `void *`.
 
+## Example
+
 The following sample generates C2824:
 
 ```cpp

docs/error-messages/compiler-errors-2/compiler-error-c2825.md

@@ -10,6 +10,8 @@ ms.assetid: c832f1c1-5184-4fc2-9356-12b21daa7af3
 
 > var : must be a class or namespace when followed by '::'
 
+## Remarks
+
 An unsuccessful attempt was made to form a qualified name.
 
 For example, make sure that your code does not contain a function declaration where the function name begins with ::.

docs/error-messages/compiler-errors-2/compiler-error-c2827.md

@@ -10,6 +10,8 @@ ms.assetid: cb3e5814-0c92-40e4-b620-98578ae3003a
 
 > 'operator operator' cannot be globally overridden with unary form
 
+## Remarks
+
 The operator cannot have a unary form outside of an object.
 
 ### To fix by using the following possible solutions

docs/error-messages/compiler-errors-2/compiler-error-c2828.md

@@ -10,6 +10,8 @@ ms.assetid: d8df6ed4-5954-46c2-b59b-52881d4e923d
 
 > 'operator operator' cannot be globally overridden with binary form
 
+## Remarks
+
 The operator cannot have a binary form outside of an object.
 
 ### To fix by using the following possible solutions

docs/error-messages/compiler-errors-2/compiler-error-c2829.md

@@ -10,6 +10,8 @@ ms.assetid: b3bfecb8-c8c1-45fd-bb85-4b42a6b8ed2b
 
 > 'operator operator' cannot have a variable parameter list
 
+## Remarks
+
 Only two operators can take variable parameter lists:
 
 - Function call `()`

docs/error-messages/compiler-errors-2/compiler-error-c2830.md

@@ -10,4 +10,6 @@ ms.assetid: 91607d2d-6aab-4c1b-b253-a7b8ec37760e
 
 > only placement parameters to 'operator new' can have default values
 
+## Remarks
+
 The standard formal parameters for [operator new](../../standard-library/new-operators.md#op_new) cannot have default values. Only user-defined placement parameters can specify defaults.

docs/error-messages/compiler-errors-2/compiler-error-c2831.md

@@ -10,6 +10,8 @@ ms.assetid: c8c04288-0889-4265-a077-17f94cbcdcc9
 
 > 'operator operator' cannot have default parameters
 
+## Remarks
+
 Only three operators can have default parameters:
 
 - [new](../../cpp/new-operator-cpp.md)
@@ -18,6 +20,8 @@ Only three operators can have default parameters:
 
 - Left parenthesis (
 
+## Example
+
 The following sample generates C2831:
 
 ```cpp

docs/error-messages/compiler-errors-2/compiler-error-c2833.md

@@ -10,10 +10,14 @@ ms.assetid: b9418ce1-e2ee-4599-8959-6fde89c27569
 
 > 'operator *operator-name*' is not a recognized operator or type
 
+## Remarks
+
 The word **`operator`** must be followed by an *operator-name* that you want to override or a type you want to convert.
 
 For a list of the operators that you can define in a managed type, see [User-defined Operators](../../dotnet/user-defined-operators-cpp-cli.md).
 
+## Example
+
 The following sample generates C2833:
 
 ```cpp