docs: remove superfluous \string prefix

[muzimuzhi]

As the \footnote is already redefined to re-tokenize its argument, there's no need to prefix commands in short verbs |...| by \string.

Current (in pythontex.pdf for v0.18 from 2021/06/06)

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Related codes

pythontex/pythontex/pythontex.dtx

Lines 82 to 109 in d0beafa

	% Create a short verbatim pipe that handles quotation marks properly
	\begingroup
	\catcode`\|=\active
	\gdef\pipe@active@verbatim{%
	\begingroup
	\let\do\@makeother\dospecials
	\catcode`\|=\active
	\catcode`\`=\active
	\catcode`\'=\active
	\catcode`\<=\active
	\catcode`\>=\active
	\catcode`\-=\active
	\catcode`\,=\active
	\catcode`\ =\active
	\pipe@active@verbatim@i}
	\gdef\pipe@active@verbatim@i#1|{%
	\endgroup
	\begingroup
	\def\FV@SV@pipe@active@verbatim{%
	\FV@Gobble
	\expandafter\FV@ProcessLine\expandafter{#1}}%
	%\let\FV@BeginVBox\relax
	%\let\FV@EndVBox\relax
	%\def\FV@BProcessLine##1{\FancyVerbFormatLine{##1}}%
	\BUseVerbatim{pipe@active@verbatim}%
	\endgroup}
	\AtBeginDocument{\let|\pipe@active@verbatim}
	\endgroup

pythontex/pythontex/pythontex.dtx

Lines 127 to 137 in d0beafa

	\let\orig@footnote\footnote
	\renewcommand{\footnote}{%
	\begingroup
	\let\do\@makeother
	\dospecials
	\catcode`\{=1
	\catcode`\}=2
	\new@footnote}
	\newcommand{\new@footnote}[1]{%
	\endgroup
	\orig@footnote{\scantokens{#1}}}