Fix typos in Readme.md and highcharter-helpers

Change-Id: I5e2ecf3cdbe391f1521a5383e2a525703905e00e
diff --git a/man/highcharter-helpers.Rd b/man/highcharter-helpers.Rd
index 5dac932..94716c8 100644
--- a/man/highcharter-helpers.Rd
+++ b/man/highcharter-helpers.Rd
@@ -33,7 +33,7 @@
 Experimental convenience function for plotting typical frequency by year graphs with confidence intervals using highcharter.
 \bold{Warning:} This function may be moved to a new package.
 
-Adds on-click events to data points of highcarts that were constructed with
+Adds on-click events to data points of highcharts that were constructed with
 \code{\link{frequencyQuery}} or \code{\link{collocationScoreQuery}}. Clicks on data points
 then launch KorAP web UI queries for the given query term and virtual corpus in
 a separate tab.