Added Path_ChangeExtension article

Author: waqasm78

docs2/pages/documentations/path/path-change-extension.md

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+# Path_ChangeExtension
+
+`Path_ChangeExtension` returns a new string in which all occurrences of a specified `oldValye` Unicode character or String in the `source` string are replaced with another specified `newValue` Unicode character or String.
+
+```csharp
+Path_ChangeExtension (
+	@path NVARCHAR (4000),
+	@extension NVARCHAR (4000)
+	)
+RETURNS NVARCHAR (4000)
+```
+
+## Parameters
+
+  - **path**: The path information to modify.
+  - **extension**: The new extension (with or without a leading period). Specify `null` to remove an existing extension from `path`.
+
+## Returns
+
+ - The modified path information.
+
+## Example
+
+```csharp
+SELECT SQLNET::Path_ChangeExtension('C:\Temp\MyTest.txt', '.ext')
+```

docs2/pages/documentations/path/path.md

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+# Path
+
+Performs operations on string instances that contain file or directory path information. These operations are performed in a cross-platform manner.
+
+| Name | Description | Example |
+| :--- | :---------- | :------ |
+| [Path_ChangeExtension(path, extension)](/path-change-extension) | Changes the extension of a path string. | [Try it]()|