I see what you mean. **readWriteImageVideo** is not defined, but not **readwriteimagevideo**.  Also, there is no sense in highlighting `imwrite` accross the whole document, isn't it? So, please, improve **"Load, Modify, and Save an Image"** tutorial too.

*P.S. Usually, consistent must be all items started from the lowest abstraction level. In this case it's file, and proposed version satisfies it, check the `copyTo() <mat-copyto>` or `clone() <mat-clone>`, etc.*