libbpf: Fix some incorrect @param descriptions in the comment of libbpf.h

Fix up some of missing or incorrect @param descriptions for libbpf public APIs
in libbpf.h.

Signed-off-by: Jianyun Gao <jianyungao89@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251118033025.11804-1-jianyungao89@gmail.com
1 file changed