Fix link in the docs about ResourceImporterTextureAtlas #15375

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 0s
🤖 Android / Template (target=template_release)	26m 48s
🌐 Web / Template (target=template_release)	26m 16s
🐧 Linux / Editor w/ Mono (target=editor)	49m 7s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	17m 47s
🍏 iOS / Template (target=template_release)	18m 5s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	55m 56s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	26m 52s
🍎 macOS / Editor (target=editor, tests=yes)	37m 8s
🐧 Linux / Template w/ Mono (target=template_release)	23m 22s
🍎 macOS / Template (target=template_release)	23m 35s
🐧 Linux / Minimal template (target=template_release, everything disabled)	25m 31s
🏁 Windows / Editor (target=editor, tests=yes)	1h 32m 24s
🏁 Windows / Template (target=template_release)	29m 20s
🪲 Godot CPP / Build and test Godot CPP	12m 55s
	7h 46m 6s

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