Doc: sync functableentry markup choices with website style.

Jonathan Katz felt that slightly different indentation settings made
for a better-looking result, so sync stylesheet-fo.xsl (for PDF) and
stylesheet.css (for non-website-style HTML) with those choices.

Discussion: https://postgr.es/m/31464.1587156281@sss.pgh.pa.us

doc/src/sgml/stylesheet-fo.xsl

@@ -82,8 +82,8 @@
   <!-- indent all but first line of entries in tables of functions -->
   <xsl:choose>
     <xsl:when test="self::entry[@role='functableentry']">
-      <xsl:attribute name="margin-left">5em</xsl:attribute>
-      <xsl:attribute name="text-indent">-5em</xsl:attribute>
+      <xsl:attribute name="margin-left">4em</xsl:attribute>
+      <xsl:attribute name="text-indent">-3.5em</xsl:attribute>
       <xsl:attribute name="text-align">left</xsl:attribute>
     </xsl:when>
   </xsl:choose>

doc/src/sgml/stylesheet.css

@@ -78,15 +78,10 @@ div.example {
 
 /* formatting for entries in tables of functions: indent all but first line */
 
-th.functableentry {
-	padding-left: 5em;
-	text-indent: -5em;
-	text-align: left;
-}
-
+th.functableentry,
 td.functableentry {
-	padding-left: 5em;
-	text-indent: -5em;
+	padding-left: 4em;
+	text-indent: -3.5em;
 	text-align: left;
 }