[tables] Remove unused 'libefftabvaluenarrow'.

Author: jensmaurer

source/tables.tex

@@ -417,18 +417,6 @@
  \end{LibEffTab}
 }
 
-% usage: \begin{libefftabvaluenarrow}{TITLE}{XREF}
-% produces a two-column effects table with right column
-% header "Value", width 1.5 in. Used in basic_string_view effects
-% tables in standard.
-\newenvironment{libefftabvaluenarrow}[2]
-{
- \begin{LibEffTab}{#1}{#2}{Value}{1.5in}
-}
-{
- \end{LibEffTab}
-}
-
 % Same as libefftabvalue except that it uses a long table and a
 % slightly wider column.
 \newenvironment{longlibefftabvalue}[2]