MINOR: [Docs] Fixed broken link in GDB extension documentation
MINOR: [Docs] Fixed broken link in GDB extension documentation

Minor PR to fix a broken link in the documentation

Closes #12343 from joosthooz/fix_link_gdbext

Authored-by: Joost Hoozemans <a525ba1a87f7540119b4ee88ceb5a152fe169863@msn.com>
Signed-off-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>

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