add more plugins to emacs section of guide (#1510)

Add more plugins to Emacs section of guide, including
a section for Evil Mode

pkgs/racket-doc/scribblings/guide/other-editors.scrbl

@@ -85,6 +85,10 @@ popular among Racketeers as well.
        Debian and Ubuntu packages for Paredit are available under the
        name @tt{paredit-el}.}
 
+ @item{@hyperlink["https://github.com/Fuco1/smartparens"]{Smartparens}
+       is a minor mode for editing s-expressions, keeping parentheses
+       balanced, etc.  Similar to Paredit.}
+
  @item{Alex Shinn's
        @hyperlink["http://synthcode.com/wiki/scheme-complete"]{scheme-complete}
        provides intelligent, context-sensitive code completion. It
@@ -110,6 +114,24 @@ popular among Racketeers as well.
 
 ]
 
+@subsection{Packages specific to Evil Mode}
+
+@itemlist[
+
+ @item{@hyperlink["https://github.com/willghatch/emacs-on-parens"]{on-parens}
+       is a wrapper for smartparens motions to work better with
+       evil-mode's normal state.}
+
+ @item{@hyperlink["https://github.com/timcharper/evil-surround"]{evil-surround}
+       provides commands to add, remove, and change parentheses and
+       other delimiters.}
+
+ @item{@hyperlink["https://github.com/noctuid/evil-textobj-anyblock"]{evil-textobj-anyblock}
+       adds a text-object that matches the closest of any
+       parenthesis or other delimiter pair.}
+
+]
+
 @; ------------------------------------------------------------
 
 @section{Vim}