Minor fixes.

Author: torkar

README.md

@@ -33,7 +33,7 @@ GitHub (re)builds and (re)deploys the website.
 
 ## Generating the static site
 
-1. Install R packages:  bookdown
+1. Install R packages:  bookdown, arm
 
 2. Install on OS and ensure on PATH: pandoc, pandoc-citeproc, pdflatex
 

src/stan-users-guide/regression.Rmd

@@ -278,7 +278,7 @@ regression models may be used.  These generalized linear models vary
 only in the link function they use to map linear predictions in
 $(-\infty,\infty)$ to probability values in $(0,1)$.  Their respective
 link functions, the logistic function and the standard normal cumulative distribution
-function, are both sigmoid functions (i.e., they are both \textit{S}-shaped).
+function, are both sigmoid functions (i.e., they are both *S*-shaped).
 
 A logistic regression model with one predictor and an intercept is coded as
 follows.