doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/physmem.h b/include/physmem.h
index 03d3a78..c88ae96 100644
--- a/include/physmem.h
+++ b/include/physmem.h
@@ -16,6 +16,6 @@
  * @param c	The character to set each byte of the region to.
  * @param n	The number of bytes to set.
  *
- * @return	The physical address of the memory which was set.
+ * Return:	The physical address of the memory which was set.
  */
 phys_addr_t arch_phys_memset(phys_addr_t s, int c, phys_size_t n);