Reword to not call pulldown-cmark a "rendering"

Author: Mark-Simulacrum

_posts/2018-03-29-Rust-1.25.md

@@ -62,9 +62,9 @@ domain there shortly. We hope this will bring more attention to a great
 resource, and you'll get a local copy with your local documentation.
 
 Second, back in Rust 1.23, we talked about the change from Hoedown to
-pulldown-cmark. In Rust 1.25, pulldown-cmark is now the default rendering. We
-have finally removed the last bit of C from rustdoc, and now properly follow
-the CommonMark spec.
+pulldown-cmark. In Rust 1.25, pulldown-cmark is now the default. We have
+finally removed the last bit of C from rustdoc, and now properly follow the
+CommonMark spec.
 
 Finally, in [RFC 1358], `#[repr(align(x))]` was accepted. In Rust
 1.25, [it is now stable]! This attribute lets you set the [alignment]