Add docs for bin source, not lib source code

If a crate has both a lib and a bin target, cargo will prefer to
generate for the library target[1]. By renaming the library target, we
force cargo to document the binary instead.

[1]: 3b379fcc54/src/doc/src/reference/cargo-targets.md (the-doc-field)

{{project-name}}-ebpf/Cargo.toml

@@ -15,3 +15,10 @@ which = { workspace = true }
 [[bin]]
 name = "{{ project-name }}_ebpf"
 path = "src/main.rs"
+
+# Tip: if you want to get aya-ebpf documentation in your crate docs, try
+# running `cargo doc --all`. This block makes cargo doc skip the dummy library
+# (see {{ project-name }}/Cargo.toml for more details)
+[lib]
+name = "{{ project-name | snake_case }}_ebpf_dummy"
+doc = false