[PATCH bpf-next v2] Documentation/bpf: Use valid and new links in index.rst

[Tiezhu Yang <yangtiezhu@loongson.cn>]

There exists an error "404 Not Found" when I click the html link of
"Documentation/networking/filter.rst" in the BPF documentation [1],
fix it.

Additionally, use the new links about "BPF and XDP Reference Guide"
and "bpf(2)" to avoid redirects.

[1] https://www.kernel.org/doc/html/latest/bpf/

Fixes: d9b9170a2653 ("docs: bpf: Rename README.rst to index.rst")
Fixes: cb3f0d56e153 ("docs: networking: convert filter.txt to ReST")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---

v2:
  - Fix a typo "clik" to "click" in the commit message, sorry for that

 Documentation/bpf/index.rst | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/bpf/index.rst b/Documentation/bpf/index.rst
index 26f4bb3..1b901b4 100644
--- a/Documentation/bpf/index.rst
+++ b/Documentation/bpf/index.rst
@@ -68,7 +68,7 @@ Testing and debugging BPF
 
 
 .. Links:
-.. _Documentation/networking/filter.rst: ../networking/filter.txt
+.. _Documentation/networking/filter.rst: ../networking/filter.html
 .. _man-pages: https://www.kernel.org/doc/man-pages/
-.. _bpf(2): http://man7.org/linux/man-pages/man2/bpf.2.html
-.. _BPF and XDP Reference Guide: http://cilium.readthedocs.io/en/latest/bpf/
+.. _bpf(2): https://man7.org/linux/man-pages/man2/bpf.2.html
+.. _BPF and XDP Reference Guide: https://docs.cilium.io/en/latest/bpf/
-- 
2.1.0