Make doxygen generate a spy.tag in the doc files #57

Job	Run time
clang-cl (Debug)	39s
msvc (Debug)	44s
clang-cl (Release)	44s
msvc (Release)	44s
dpcpp (dpcpp, x86, Debug)	42s
clang (clang, x86, Debug)	42s
dpcpp (dpcpp, sycl, Debug)	43s
clang (clang, x86, Release)	41s
dpcpp (dpcpp, x86, Release)	41s
macosx (clang, x86_osx, Debug)	7s
gcc (gcc, x86, Debug)	1s
dpcpp (dpcpp, sycl, Release)	42s
macosx (clang, x86_osx, Release)	6s
gcc (gcc, x86, Release)	1s
nvcc	41s
gcc (gcc, aarch64, -Wno-psabi, Debug)	26s
gcc (gcc, aarch64, -Wno-psabi, Release)	1s
wasm (clang, wasm, Debug)	38s
riscv (clang, rvv128, Debug)	41s
gcc (gcc, aarch64.sve, -Wno-psabi, Debug)	41s
wasm (clang, wasm, Release)	40s
riscv (clang, rvv128, Release)	40s
gcc (gcc, aarch64.sve, -Wno-psabi, Release)	40s
gcc (gcc, aarch64.sve2, -Wno-psabi, Debug)	27s
gcc (gcc, aarch64.sve2, -Wno-psabi, Release)	41s
gcc (gcc, ppc64, -Wno-psabi, Debug)	1s
gcc (gcc, ppc64, -Wno-psabi, Release)	1s
	13m 35s

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