thunderbolt: Fix one kernel-doc comment

Fix a spelling errors in kernel doc comment, silence the warning:

drivers/thunderbolt/tb.c:760: warning: expecting prototype for tb_maximum_banwidth(). Prototype was for tb_maximum_bandwidth() instead
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7048Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/tb.c

@@ -739,7 +739,7 @@ static bool tb_asym_supported(struct tb_port *src_port, struct tb_port *dst_port
 }
 
 /**
- * tb_maximum_banwidth() - Maximum bandwidth over a single link
+ * tb_maximum_bandwidth() - Maximum bandwidth over a single link
  * @tb: Domain structure
  * @src_port: Source protocol adapter
  * @dst_port: Destination protocol adapter