Add missing descriptions to TextServer's constants #262

Job	Run time
📊 Static checks / Code style, file formatting, and docs	2m 58s
🌐 Web / Template (target=template_release)	20m 4s
🍎 macOS / Editor (target=editor, tests=yes)	44m 16s
🍎 macOS / Template (target=template_release)	14m 1s
🤖 Android / Template (target=template_release)	28m 8s
🐧 Linux / Editor w/ Mono (target=editor)	33m 44s
🐧 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)	36m 16s
🍏 iOS / Template (target=template_release)	12m 55s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	31m 32s
🏁 Windows / Editor (target=editor, tests=yes)	42m 58s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	26m 55s
🏁 Windows / Template (target=template_release)	29m 41s
🐧 Linux / Template w/ Mono (target=template_release)	22m 42s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 27s
🪲 Godot CPP / Build and test Godot CPP	6m 56s
	6h 6m 33s

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