Small typos in links in the document

Hi,
I was trying to find my way in the new updates of the annotation vocabulary. 
And I came across these small typos in the https://www.w3.org/ns/oa/index <https://www.w3.org/ns/oa/index> page. 
Links to the different serializations are not correctly linked. 
  - Turtle: should be https://www.w3.org/ns/oa.ttl <https://www.w3.org/ns/oa.ttl> 
 .. and the rest I guess should follow the same pattern.

Thanks for the nice job.

Best,
Ghislain 
--------------------------------------------
Ghislain A. Atemezing, Ph.D 
R&D Engineer
@ Mondeca, Paris, France
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