basic R Lecture updates

[carriewright11]

These are based on the questions we got:

• maybe cover spaces - got a few questions about that
• maybe define that a vector has multiple items
• Someone was not working in R Studio... maybe we can add something about that here:

https://jhudatascience.org/intro_to_r/modules/Basic_R/Basic_R.html#2

[carriewright11]

I wonder if we should suggest that some people might want to wait to try to practice until the lab? or at least a reminder that we will have lab practice time. What do you think @avahoffman ?

[carriewright11]

maybe we should move the slide about comments out to the rstudio lecture? - if so would want to drop this from the summary

[carriewright11]

maybe add a reminder for using quotes for characters to the summary

[carriewright11]

maybe give examples for times you would use replace = TRUE vs replace = FALSE for sample()