Build defmt-semihosting docs for the thumbv7em-none-eabihf target

Author: Veykril

firmware/defmt-semihosting/Cargo.toml

@@ -18,3 +18,8 @@ semihosting = { version = "0.1.19", features = ["stdio"] }
 
 [features]
 critical-section-single-core = ["cortex-m/critical-section-single-core"]
+
+[package.metadata.docs.rs]
+features = [ "alloc" ]
+rustdoc-args = [ "--cfg=docsrs" ]
+targets = [ "thumbv7em-none-eabihf" ]