libcamera: Unify Doxygen file directive prefix for formats.h

libcamera has two formats.h headers, an internal one in
include/libcamera/internal/, and a public one generated at build time.
The convention is to prefix the internal header name with
libcamera/internal/ in the Doxygen file directive, but formats.cpp only
uses internal/ as a prefix. Unify it with the rest of the code base.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/formats.cpp

@@ -16,7 +16,7 @@
 #include <libcamera/formats.h>
 
 /**
- * \file internal/formats.h
+ * \file libcamera/internal/formats.h
  * \brief Types and helper functions to handle libcamera image formats
  */