[PATCH -next] counter: fix docum. build problems after filename change

[Randy Dunlap]

Fix documentation build warnings due to a source file being
renamed.

WARNING: kernel-doc '../scripts/kernel-doc -rst -enable-lineno -sphinx-version 1.8.5 -export ../drivers/counter/counter.c' failed with return code 2

Error: Cannot open file ../drivers/counter/counter.c

Fixes: d70e46af7531 ("counter: Internalize sysfs interface code")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
Cc: linux-iio@xxxxxxxxxxxxxxx
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 Documentation/driver-api/generic-counter.rst |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20211001.orig/Documentation/driver-api/generic-counter.rst
+++ linux-next-20211001/Documentation/driver-api/generic-counter.rst
@@ -247,7 +247,7 @@ for defining a counter device.
 .. kernel-doc:: include/linux/counter.h
    :internal:
 
-.. kernel-doc:: drivers/counter/counter.c
+.. kernel-doc:: drivers/counter/counter-core.c
    :export:
 
 Driver Implementation