[doc] correct specific heat formula (added a missing index 2) #60

	name: Test

	on: [push]

	jobs:
	build:
	runs-on: ubuntu-20.04

	steps:
	- uses: actions/checkout@v3

	- name: Setup Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.8

	- name: apt
	run: \|
	sudo apt update
	sudo apt install \
	gcc gfortran cmake wget liblapack-dev \
	openmpi-bin libopenmpi-dev

	- name: pip install
	run: \|
	python -m pip install -U pip
	python -m pip install numpy scipy toml
	python -m pip install typing_extensions

	- name: make workspace
	run: cmake -E make_directory ${{runner.workspace}}/build

	- name: cmake
	working-directory: ${{runner.workspace}}/build
	shell: bash
	run: cmake -DCMAKE_INSTALL_PREFIX=${{runner.workspace}}/usr -DCMAKE_VERBOSE_MAKEFILE=1 $GITHUB_WORKSPACE

	- name: build
	working-directory: ${{runner.workspace}}/build
	shell: bash
	run: cmake --build ./

	- name: ctest
	working-directory: ${{runner.workspace}}/build
	shell: bash
	run: ctest -V

	- name: install
	working-directory: ${{runner.workspace}}/build
	shell: bash
	run: make install


	docs:
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.8

	- name: Prepare LaTeX env
	run: \|
	sudo apt install \
	texlive-latex-recommended texlive-latex-extra \
	texlive-lang-japanese texlive-fonts-recommended texlive-fonts-extra latexmk
	kanji-config-updmap-sys ipaex

	- name: Install python packages
	run: \|
	python -m pip install --upgrade pip
	pip install sphinx sphinxcontrib-spelling

	- name: Build
	run: \|
	cd ${GITHUB_WORKSPACE}
	cmake -E make_directory build
	cd build
	cmake -DDocument=ON ../
	make doc

Provide feedback