auto merge of #18724 : gamazeps/rust/toc, r=alexcrichton

Using @adrientetar advices

Closes #17505

mk/docs.mk

@@ -28,13 +28,13 @@
 DOCS := index intro tutorial guide guide-ffi guide-macros guide-lifetimes \
 	guide-tasks guide-container guide-pointers guide-testing \
 	guide-plugin guide-crates complement-bugreport \
-	complement-lang-faq complement-design-faq complement-project-faq rust \
+	complement-lang-faq complement-design-faq complement-project-faq \
     rustdoc guide-unsafe guide-strings reference
 
 PDF_DOCS := guide reference
 
-RUSTDOC_DEPS_rust := doc/full-toc.inc
-RUSTDOC_FLAGS_rust := --html-in-header=doc/full-toc.inc
+RUSTDOC_DEPS_reference := doc/full-toc.inc
+RUSTDOC_FLAGS_reference := --html-in-header=doc/full-toc.inc
 
 L10N_LANGS := ja