fix links to containerignore doc

Signed-off-by: Philippe Vlérick <pvlerick@gmail.com>

docs/buildah-add.1.md

@@ -89,7 +89,7 @@ buildah add containerID 'passwd' 'certs.d' /etc
 
 ## FILES
 
-### .containerignore
+### .containerignore/.dockerignore
 
 If a .containerignore or .dockerignore file exists in the context directory,
 `buildah add` reads its contents. If both exist, then .containerignore is used.
@@ -135,7 +135,7 @@ Exclude all doc files except Help.doc when copying content into the container.
 
 This functionality is compatible with the handling of .containerignore files described here:
 
-https://github.com/containers/buildah/blob/main/docs/containerignore.5.md
+https://github.com/containers/common/blob/main/docs/containerignore.5.md
 
 ## SEE ALSO
 buildah(1), containerignore(5)

docs/buildah-build.1.md

@@ -1401,7 +1401,7 @@ Exclude all doc files except Help.doc from the image.
 
 This functionality is compatible with the handling of .containerignore files described here:
 
-https://github.com/containers/buildah/blob/main/docs/containerignore.5.md
+https://github.com/containers/common/blob/main/docs/containerignore.5.md
 
 **registries.conf** (`/etc/containers/registries.conf`)
 

docs/buildah-copy.1.md

@@ -133,7 +133,7 @@ Exclude all doc files except Help.doc when copying content into the container.
 
 This functionality is compatible with the handling of .containerignore files described here:
 
-https://github.com/containers/buildah/blob/main/docs/containerignore.5.md
+https://github.com/containers/common/blob/main/docs/containerignore.5.md
 
 ## SEE ALSO
 buildah(1), containerignore(5)