Minor fixes

Author: Akvannortwick

docs/api/covidcast_changelog.md

@@ -1,4 +1,4 @@
-        ---
+---
 title: Signal Changelog
 parent: COVIDcast API
 nav_order: 3
@@ -44,11 +44,10 @@ Duplicate survey weights had corrupted historical figures for the following sign
 #### 20 November 2020  
 
 Due to a bug in our data processing system, estimates of the percentage of people reporting that they have been tested for COVID-19 calculated before October 8th were incorrect. 
-We incorrectly treated an answer of “no” as a missing response, which affected the smoothed_tested_14d and smoothed_wtested_14d signals from the fb-survey source. 
+We incorrectly treated an answer of “no” as a missing response, which affected the `smoothed_tested_14d` and `smoothed_wtested_14d` signals from the `fb-survey` source. 
 
 As of Nov. 20th, the error has been corrected and all affected data reissued. 
 
-
 ### `google-survey`
 ### `ght`