Update man page.

MANUAL.txt

@@ -1,7 +1,7 @@
 ---
 title: Pandoc User's Guide
 author: John MacFarlane
-date: October 20, 2020
+date: November 3, 2020
 ---
 
 # Synopsis

man/pandoc.1

@@ -1,7 +1,7 @@
 .\"t
 .\" Automatically generated by Pandoc 2.11.0.4
 .\"
-.TH "Pandoc User\[cq]s Guide" "" "October 20, 2020" "pandoc 2.11.0.4" ""
+.TH "Pandoc User\[cq]s Guide" "" "November 3, 2020" "pandoc 2.11.1" ""
 .hy
 .SH NAME
 pandoc - general markup converter
@@ -1748,6 +1748,7 @@ csl: ieee
 bibliography:
 - foobar.bib
 - barbaz.json
+citation-abbreviations: abbrevs.json
 
 # Filters will be assumed to be Lua filters if they have
 # the .lua extension, and json filters otherwise.  But
@@ -2489,6 +2490,10 @@ sets the CSS \f[C]color\f[R] property on all links.
 \f[B]\f[CB]monofont\f[B]\f[R]
 sets the CSS \f[C]font-family\f[R] property on \f[C]code\f[R] elements.
 .TP
+\f[B]\f[CB]monobackgroundcolor\f[B]\f[R]
+sets the CSS \f[C]background-color\f[R] property on \f[C]code\f[R]
+elements and adds extra padding.
+.TP
 \f[B]\f[CB]linestretch\f[B]\f[R]
 sets the CSS \f[C]line-height\f[R] property on the \f[C]html\f[R]
 element, which is preferred to be unitless.
@@ -2500,6 +2505,31 @@ element.
 \f[B]\f[CB]margin-left\f[B]\f[R], \f[B]\f[CB]margin-right\f[B]\f[R], \f[B]\f[CB]margin-top\f[B]\f[R], \f[B]\f[CB]margin-bottom\f[B]\f[R]
 sets the corresponding CSS \f[C]padding\f[R] properties on the
 \f[C]body\f[R] element.
+.PP
+To override or extend some CSS for just one document, include for
+example:
+.IP
+.nf
+\f[C]
+---
+header-includes: |
+  <style>
+  blockquote {
+    font-style: italic;
+  }
+  tr.even {
+    background-color: #f0f0f0;
+  }
+  td, th {
+    padding: 0.5em 2em 0.5em 0.5em;
+  }
+  tbody {
+    border-bottom: none;
+  }
+  </style>
+---
+\f[R]
+.fi
 .SS Variables for HTML math
 .TP
 \f[B]\f[CB]classoption\f[B]\f[R]