remove irrelevant comment in references

Author: mateuszbaran

docs/src/misc/references.md

@@ -1,10 +1,4 @@
 # Literature
 
-We are slowly moving to using [`DocumenterCitations.jl`](https://github.com/JuliaDocs/DocumenterCitations.jl/).
-The goal is to have all references used / mentioned in the documentation of Manifolds.jl also listed here.
-If you notice a reference still defined in a footnote, please change it into a BibTeX reference and [open a PR](https://github.com/JuliaManifolds/Manifolds.jl/compare)
-
-Usually you will find a small reference section at the end of every documentation page that contains references for just that page.
-
 ```@bibliography
 ```