[PATCH] Docs/kernel-api.rst: Remove removed blk-tag.c reference

[Marcos Paulo de Souza]

After 7ca01926463a, legacy rq tagging was removed, so block/blk-tag.c
does not exists anymore. When generating pdfdocs, sphinx complains about
this missing file:

Error: Cannot open file ./block/blk-tag.c
Error: Cannot open file ./block/blk-tag.c
Error: Cannot open file ./block/blk-tag.c
Error: Cannot open file ./block/blk-tag.c

So remove blk-tag.c traces from kernel-api.rst file to silence these
warnings.

Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@xxxxxxxxx>
---
 Documentation/core-api/kernel-api.rst | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/Documentation/core-api/kernel-api.rst b/Documentation/core-api/kernel-api.rst
index 3431337ee4e6..cdd24943fbcc 100644
--- a/Documentation/core-api/kernel-api.rst
+++ b/Documentation/core-api/kernel-api.rst
@@ -291,12 +291,6 @@ Block Devices
 .. kernel-doc:: block/blk-lib.c
    :export:
 
-.. kernel-doc:: block/blk-tag.c
-   :export:
-
-.. kernel-doc:: block/blk-tag.c
-   :internal:
-
 .. kernel-doc:: block/blk-integrity.c
    :export:
 
-- 
2.16.4