Use TRUE and FALSE instead of T and F

Change-Id: I4f419313d56a9b58a96879ff6df7c9f2d873dfb4
diff --git a/man/percent.Rd b/man/percent.Rd
index 13a1673..1e40204 100644
--- a/man/percent.Rd
+++ b/man/percent.Rd
@@ -14,7 +14,7 @@
 }
 \description{
 Convenience function for converting frequency tables of alternative variants
-(generated with \code{as.alternatives=T}) to percent.
+(generated with \code{as.alternatives=TRUE}) to percent.
 }
 \examples{
 \donttest{