fix typo

[TORIFUKUKaiou]

https://docs.docker.jp/index.html
とてもわかりやすかったです！　ありがとうございます。

typoを見つけましたのでプルリクを送ります。
v24.0 から派生させて修正をつくりました。
派生元、マージ先に誤りがありましたら作り直しますのでご連絡をくださいませ。

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ただ、申し訳ありませんが確認が不十分でして、htmlを出力しての確認ができてはおりません。
別のIssueを立てたほうがいいかもしれませんがここで状況をお伝えしておきます。

• docker run --rm -v pwd:/mnt ghcr.io/zembutsu/docs.docker.jp/latex make clean latexpdfjaは、「docker: Error response from daemon: Head "https://ghcr.io/v2/zembutsu/docs.docker.jp/latex/manifests/latest": denied.」でした。https://github.com/zembutsu?tab=packages を見る限り公開されているものではないようにおもいました。（ghcr.ioの設定が不足しているなど、私が勘違いしているだけかもしれません:pray:）
• Dockerfileがありましたのでbuildを試みましたが以下のエラーとなりました。ビルドに使ったコマンドは、 docker build -t docs.docker.jp .です。

macOS Ventura 13.5.1(M2)

docker -v
Docker version 24.0.5, build ced0996

docker build -t docs.docker.jp .
(略)
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/main/libx/libxext/libxext6_1.3.3-1_arm64.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/universe/f/fonts-ipaexfont/fonts-ipaexfont-gothic_00301-2ubuntu2_all.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/main/libx/libxfixes/libxfixes3_5.0.1-2_arm64.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/universe/d/dvi2ps-fontdata/dvi2ps-fontdata-ja_1.0.1-3_all.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/main/f/fonts-font-awesome/fonts-font-awesome_4.5.0~dfsg-1_all.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/universe/f/fonts-lobstertwo/fonts-lobster_2.0-2_all.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/universe/g/gv/gv_3.7.4-1_arm64.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/universe/l/latex-cjk-chinese-arphic/latex-cjk-chinese-arphic-bkai00mp_1.23_all.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/pool/main/m/mesa/libglapi-mesa_18.0.5-0ubuntu0~16.04.1_arm64.deb  Connection timed out [IP: 185.125.190.39 80]
2569.6 
2569.6 E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
2569.6 Fetched 1297 MB in 42min 46s (505 kB/s)
------
Dockerfile:14
--------------------
  13 |     
  14 | >>> RUN apt-get -y update \
  15 | >>>         && apt-get -y install \
  16 | >>>             texlive \
  17 | >>>             texlive-lang-cjk \
  18 | >>>             xdvik-ja \
  19 | >>>             dvipsk-ja \
  20 | >>>             gv \
  21 | >>>             texlive-fonts-recommended \
  22 | >>>             texlive-fonts-extra \
  23 | >>>         && apt-get clean
  24 |     RUN apt-get -y update \
--------------------
ERROR: failed to solve: process "/bin/sh -c apt-get -y update         && apt-get -y install             texlive             texlive-lang-cjk             xdvik-ja             dvipsk-ja             gv             texlive-fonts-recommended             texlive-fonts-extra         && apt-get clean" did not complete successfully: exit code: 100

WSL2 Ubuntu 22.04.2 LTS

docker -v
Docker version 24.0.2, build cb74dfc

docker build -t docs.docker.jp .
(略)
 => ERROR [6/7] RUN pip install Sphinx==1.4.8                                                                      2.6s
------
 > [6/7] RUN pip install Sphinx==1.4.8:
0.618 Collecting Sphinx==1.4.8
1.249   Downloading https://files.pythonhosted.org/packages/b5/db/a93672c16532ee4066cebe47f9a72e774c9be44b976110a7a16cecc016fd/Sphinx-1.4.8-py2.py3-none-any.whl (1.6MB)
1.753 Collecting alabaster<0.8,>=0.7 (from Sphinx==1.4.8)
2.040   Downloading https://files.pythonhosted.org/packages/94/71/a8ee96d1fd95ca04a0d2e2d9c4081dac4c2d2b12f7ddb899c8cb9bfd1532/alabaster-0.7.13.tar.gz
2.111     Complete output from command python setup.py egg_info:
2.111     Traceback (most recent call last):
2.111       File "<string>", line 1, in <module>
2.111       File "/tmp/pip-build-3zKgpZ/alabaster/setup.py", line 27
2.111         "Source": f"https://github.com/{code_ns}",
2.111                                                 ^
2.111     SyntaxError: invalid syntax
2.111
2.111     ----------------------------------------
2.123 Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-3zKgpZ/alabaster/
2.587 You are using pip version 8.1.1, however version 23.2.1 is available.
2.587 You should consider upgrading via the 'pip install --upgrade pip' command.
------
Dockerfile:29
--------------------
  27 |                 python-pip \
  28 |             && apt-get clean
  29 | >>> RUN pip install Sphinx==1.4.8
  30 |
  31 |     VOLUME ["/mnt"]
--------------------
ERROR: failed to solve: process "/bin/sh -c pip install Sphinx==1.4.8" did not complete successfully: exit code: 1