Make doxygen generate a spy.tag in the doc files #59

Job	Run time
macosx (clang, x86_osx, Debug)	23s
clang-cl (Debug)	44s
dpcpp (dpcpp, x86, Debug)	55s
macosx (clang, x86_osx, Release)	15s
dpcpp (dpcpp, sycl, Debug)	57s
clang-cl (Release)	1m 28s
msvc (Debug)	1m 9s
dpcpp (dpcpp, x86, Release)	51s
msvc (Release)	1m 17s
nvcc	1m 10s
dpcpp (dpcpp, sycl, Release)	1m 1s
riscv (clang, rvv128, Debug)	1m 23s
riscv (clang, rvv128, Release)	1m 25s
clang (clang, x86, Debug)	1m 23s
wasm (clang, wasm, Debug)	1m 23s
clang (clang, x86, Release)	1m 23s
gcc (gcc, x86, Debug)	18s
wasm (clang, wasm, Release)	1m 23s
gcc (gcc, x86, Release)	6s
gcc (gcc, aarch64, -Wno-psabi, Debug)	31s
gcc (gcc, aarch64, -Wno-psabi, Release)	28s
gcc (gcc, aarch64.sve, -Wno-psabi, Debug)	1m 24s
gcc (gcc, aarch64.sve, -Wno-psabi, Release)	1m 24s
gcc (gcc, aarch64.sve2, -Wno-psabi, Debug)	54s
gcc (gcc, aarch64.sve2, -Wno-psabi, Release)	1m 24s
gcc (gcc, ppc64, -Wno-psabi, Debug)	22s
gcc (gcc, ppc64, -Wno-psabi, Release)	22s
	25m 43s

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