Correct Wave 13 deployment date

Author: capnrefsmmat

docs/symptom-survey/coding.md

@@ -955,7 +955,7 @@ is finalized.
 
 ## Wave 13
 
-Wave 13 was deployed on January 28, 2022. For the following two weeks, about 15%
+Wave 13 was deployed on January 30, 2022. For the following two weeks, about 15%
 of respondents (selected at random) received Wave 13 and the remainder received
 Wave 12, allowing for comparisons of responses between the two waves. Wave 13 is
 available in English and the languages introduced in Wave 3.