[PATCH] docs: Fix filename for serial reference implementation

[Tobin C. Harding]

Currently documentation mentions a file but the filename has a typo in
it, underscore instead of hyphen.  This makes grep'ing for the file
hard.

Use correct filename for file amba-pl011.c

Signed-off-by: Tobin C. Harding <me@xxxxxxxx>
---
 Documentation/serial/driver | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index da193e092fc3..86e47c19a924 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -7,7 +7,7 @@ This document is meant as a brief overview of some aspects of the new serial
 driver.  It is not complete, any questions you have should be directed to
 <rmk@xxxxxxxxxxxxxxxx>
 
-The reference implementation is contained within amba_pl011.c.
+The reference implementation is contained within amba-pl011.c.
 
 
 
-- 
2.17.1