[pre-commit.ci] auto fixes from pre-commit.com hooks

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docs/maintainer/knowledge_base.md

@@ -561,9 +561,9 @@ but merely to provide a starting point with some guidelines. Please look at [oth
 
 #### Finding NumPy in cross-compiled Python packages using CMake
 
-If  you are building a Python extension via CMake with NumPy and you want it work in cross-compilation, you need to preprend to the CMake invocation in your build script the following lines:
+If you are building a Python extension via CMake with NumPy and you want it work in cross-compilation, you need to preprend to the CMake invocation in your build script the following lines:
 
-~~~sh
+```sh
 Python_INCLUDE_DIR="$(python -c 'import sysconfig; print(sysconfig.get_path("include"))')"
 Python_NumPy_INCLUDE_DIR="$(python -c 'import numpy;print(numpy.get_include())')"
 CMAKE_ARGS="${CMAKE_ARGS} -DPython_EXECUTABLE:PATH=${PYTHON}"
@@ -572,7 +572,7 @@ CMAKE_ARGS="${CMAKE_ARGS} -DPython_NumPy_INCLUDE_DIR=${Python_NumPy_INCLUDE_DIR}
 CMAKE_ARGS="${CMAKE_ARGS} -DPython3_EXECUTABLE:PATH=${PYTHON}"
 CMAKE_ARGS="${CMAKE_ARGS} -DPython3_INCLUDE_DIR:PATH=${Python_INCLUDE_DIR}"
 CMAKE_ARGS="${CMAKE_ARGS} -DPython3_NumPy_INCLUDE_DIR=${Python_NumPy_INCLUDE_DIR}"
-~~~
+```
 
 <a id="python-cross-compilation"></a>