fix typos

vignettes/datatable-reshape.Rmd

@@ -138,7 +138,7 @@ Check `?dcast` for other useful arguments and additional examples.
 
 ## 2. Limitations in current `melt/dcast` approaches
 
-So far we've seen features of `melt` and `dcast` that are implemented efficiently for `data.table`s, using internal `data.table` machinery (*fast radix ordering*, *binary search* etc..).
+So far we've seen features of `melt` and `dcast` that are implemented efficiently for `data.table`s, using internal `data.table` machinery (*fast radix ordering*, *binary search* etc...).
 
 However, there are situations we might run into where the desired operation is not expressed in a straightforward manner. For example, consider the `data.table` shown below:
 
@@ -167,7 +167,7 @@ str(DT.c1) ## gender column is character type now!
 
 #### Issues {.bs-callout .bs-callout-info}
 
-1. What we wanted to do was to combine all the `dob` and `gender` type columns together respectively. Instead we are combining *everything* together, and then splitting them again. I think it's easy to see that it's quite roundabout (and inefficient).
+1. What we wanted to do was to combine all the `dob` and `gender` type columns together respectively. Instead, we are combining *everything* together, and then splitting them again. I think it's easy to see that it's quite roundabout (and inefficient).
 
     As an analogy, imagine you've a closet with four shelves of clothes and you'd like to put together the clothes from shelves 1 and 2 together (in 1), and 3 and 4 together (in 3). What we are doing is more or less to combine all the clothes together, and then split them back on to shelves 1 and 3!