link fixes

Author: nmdefries

docs/api/covidcast_licensing.md

@@ -37,7 +37,7 @@ Attribution license](https://creativecommons.org/licenses/by/4.0/):
 * [COVID-19 Trends and Impact Survey](covidcast-signals/fb-survey.md)
 * [Doctor Visits](covidcast-signals/doctor-visits.md)
 * [Hospital Admissions](covidcast-signals/hospital-admissions.md)
-* [Indicator Combination)](covidcast-signals/indicator-combination.md) (signals with names beginning `nmf_*`
+* [Indicator Combination](covidcast-signals/indicator-combination.md) (signals with names beginning `nmf_*`)
 * [Quidel](covidcast-signals/quidel.md)
 
 You may use this data for any purpose, provided you attribute us as the original
@@ -60,8 +60,8 @@ permitted, provided you attribute us as the original source.
 These data streams are essentially mirrors of their respective sources, and are
 published here subject to the original license provided by the source:
 
-* [COVID Act Now](covidcast-signals/covid-act-now..md)
-* [DSEW Community Profile Report](covidcast-signals/dsew-cpr..md)
+* [COVID Act Now](covidcast-signals/covid-act-now.md)
+* [DSEW Community Profile Report](covidcast-signals/dsew-cpr.md)
 * [Google Health Trends](covidcast-signals/ght.md)
 * [Google Search Trends](covidcast-signals/google-symptoms.md)
 * [HHS/NSHN Hospitalizations](covidcast-signals/hhs.md)
@@ -70,7 +70,7 @@ published here subject to the original license provided by the source:
 * [NCHS Mortality](covidcast-signals/nchs-mortality.md)
 * [NSSP ED Visits](covidcast-signals/nssp.md)
 * [SafeGraph Mobility](covidcast-signals/safegraph.md)
-* [USAFacts Cases and Deaths](covidcast-signals/usafacts.md)
+* [USAFacts Cases and Deaths](covidcast-signals/usa-facts.md)
 
 More information on the license for each source is available on their respective
 documentation pages.