Remove @brief annotations from Rust API docs (backport #20769) (#20807)

* Remove @brief annotations from Rust API docs (#20769)

(cherry picked from commit d9b0fc0e3e)

# Conflicts:
#	programs/bpf/rust/invoke/src/instructions.rs
#	programs/bpf/rust/invoke/src/processor.rs
#	programs/bpf/rust/realloc/src/instructions.rs
#	programs/bpf/rust/realloc/src/lib.rs
#	programs/bpf/rust/realloc/src/processor.rs
#	programs/bpf/rust/realloc_invoke/src/instructions.rs
#	programs/bpf/rust/realloc_invoke/src/lib.rs
#	programs/bpf/rust/realloc_invoke/src/processor.rs
#	sdk/cargo-build-bpf/tests/crates/fail/src/lib.rs
#	sdk/src/precompiles.rs

* Fix conflicts

Co-authored-by: Brian Anderson <andersrb@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

web3.js/test/fixtures/noop-program/src/lib.rs

@@ -1,4 +1,4 @@
-//! @brief Example Rust-based BPF program that prints out the parameters passed to it
+//! Example Rust-based BPF program that prints out the parameters passed to it
 
 
 use solana_program::{