Modified the formatting of the documentation in DiffMatchPatch.cs so that it can work with Visual Studio's Intellisense.

[petereg92]

Modified the documentation in DiffMatchPatch.cs to use XML documentation comment formatting. This was done so that Visual Studio's Intellisense can display the documentation.

The content of the documentation should not have changed.

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[petereg92]

@googlebot I signed it!

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