Fix docs.rs URL

Author: lukipuki

Cargo.toml

@@ -3,7 +3,7 @@ name = "meshtastic"
 description = "A Rust library for communicating with and configuring Meshtastic devices."
 homepage = "https://meshtastic.org/"
 repository = "https://github.com/meshtastic/rust"
-documentation = "https://docs.rs/heapless"
+documentation = "https://docs.rs/meshtastic"
 keywords = ["meshtastic", "mesh", "lora", "tcp", "serial"]
 categories = ["embedded", "config", "encoding"]
 authors = ["Adam McQuilkin"]