uaccess: correct kernel-doc parameter format

Use the correct kernel-doc function parameter format to avoid kernel-doc
warnings:

Warning: include/linux/uaccess.h:814 function parameter 'uptr' not
 described in 'scoped_user_rw_access_size'
Warning: include/linux/uaccess.h:826 function parameter 'uptr' not
 described in 'scoped_user_rw_access'

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Randy Dunlap <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: rddunlap

include/linux/uaccess.h

@@ -806,7 +806,7 @@ for (bool done = false; !done; done = true)						\
 
 /**
  * scoped_user_rw_access_size - Start a scoped user read/write access with given size
- * @uptr	Pointer to the user space address to read from and write to
+ * @uptr:	Pointer to the user space address to read from and write to
  * @size:	Size of the access starting from @uptr
  * @elbl:	Error label to goto when the access region is rejected
  *
@@ -817,7 +817,7 @@ for (bool done = false; !done; done = true)						\
 
 /**
  * scoped_user_rw_access - Start a scoped user read/write access
- * @uptr	Pointer to the user space address to read from and write to
+ * @uptr:	Pointer to the user space address to read from and write to
  * @elbl:	Error label to goto when the access region is rejected
  *
  * The size of the access starting from @uptr is determined via sizeof(*@uptr)).