Minor updates (#7000)

* Update contributor name

See https://github.com/marc-outins

* Make text agree with current version and section title

Author: iagogv3

DESCRIPTION

@@ -56,7 +56,7 @@ Authors@R: c(
   person("Martin","Morgan",        role="ctb"),
   person("Michael","Quinn",        role="ctb"),
   person("@javrucebo","",          role="ctb"),
-  person("@marc-outins","",        role="ctb"),
+  person("Marc","Halperin",        role="ctb"),
   person("Roy","Storey",           role="ctb"),
   person("Manish","Saraswat",      role="ctb"),
   person("Morgan","Jacob",         role="ctb"),

vignettes/datatable-reshape.Rmd

@@ -153,7 +153,7 @@ DT
 ## 1 = female, 2 = male
 ```
 
-And you'd like to combine (`melt`) all the `dob` columns together, and `gender` columns together. Using the current functionality, we can do something like this:
+And you'd like to combine (`melt`) all the `dob` columns together, and `gender` columns together. Using the old functionality, we could do something like this:
 
 ```{r}
 DT.m1 = melt(DT, id.vars = c("family_id", "age_mother"))