fix: fix manual rendering

We add `// see the other repo` comments before headers (==). This one isn't a header, but a closing of the example block.

Author: matklad

docs/user/manual.adoc

@@ -18,7 +18,6 @@ To improve this document, send a pull request: +
 https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/manual.adoc[https://github.com/rust-analyzer/.../manual.adoc]
 
 The manual is written in https://asciidoc.org[AsciiDoc] and includes some extra files which are generated from the source code. Run `cargo test` and `cargo test -p xtask` to create these and then `asciidoctor manual.adoc` to create an HTML copy.
-
 ====
 
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