fix documentation build on docs.rs

see rust-lang/cargo#8811

Author: cdisselkoen

Cargo.toml

@@ -39,5 +39,5 @@ llvm-10-strict = ["llvm-10", "llvm-ir/llvm-10-strict"]
 llvm-11-strict = ["llvm-11", "llvm-ir/llvm-11-strict"]
 
 [package.metadata.docs.rs]
-# Generate docs.rs documentation with the llvm-11 feature
-features = ["llvm-11"]
+# Generate docs.rs documentation with the llvm-10 feature
+features = ["llvm-10"]