Fix grammatical error in CRDT documentation (#37)

Author: aaadotpm

pages/docs/concepts/crdt.mdx

@@ -44,7 +44,7 @@ of CRDTs.
 
 (PS: Marc Shapiro actually wrote a paper
 [Designing a commutative replicated data type](https://hal.inria.fr/inria-00177693v2/document)
-in 2007. In 2011, he reworded commutative into conflict-free in 2011, expanding
+in 2007. In 2011, he reworded commutative into conflict-free, expanding
 the definition of commutative to include state-based CRDT)
 
 According to [CAP theorem](https://en.wikipedia.org/wiki/CAP_theorem), it is