Fix crate's document

Author: JalonWong

Cargo.toml

@@ -9,7 +9,10 @@
     name = "stm32f1-hal"
     readme = "README.md"
     repository = "https://github.com/jw-mcu-rust/stm32f1-hal"
-    version = "0.0.2"
+    version = "0.0.3"
+
+    [package.metadata.docs.rs]
+        features = ["stm32f103", "xG"]
 
 [features]
     critical-section-single-core = ["cortex-m/critical-section-single-core"]