make minor changes.

R/HDs.R

@@ -21,7 +21,7 @@
 #' "The values in the files are the values reported by the drives. Sometimes,
 #' those values are out of whack. For example, in a few cases the RAW value of
 #' SMART 9 (Drive life in hours) reported a value that would make a drive 10+
-#' years old, which was not possible. In other words, it’s a good idea to have
+#' years old, which was not possible. In other words, it's a good idea to have
 #' bounds checks when you process the data."
 #'
 #' See this github page for the processing steps

R/PF.R

@@ -1517,7 +1517,7 @@ get_cloud_quantiles.PF_clouds <- function(
 #' The score vector and negative observed information matrix are computed
 #' with the (forward)
 #' particle filter. This comes at an \eqn{O(d^2)} variance where \eqn{d}
-#' is the number of periods, \eqn{d}. Thus, the approximation may be poor for long
+#' is the number of periods. Thus, the approximation may be poor for long
 #' series. The score vector can be used to perform stochastic gradient
 #' descent.
 #'