clarify species type extension#264

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s9105947 wants to merge 4 commits intoopenPMD:upcoming-2.0.0from

s9105947:speciestype-revisited

Commits on Jan 26, 2022

species type extension: formulate ideas from #256 (clarifications, adding ABNF...)
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Commits on Jan 31, 2022

replace RFC 2119 terms allcaps with bold text (comforming to PR #262)
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Commits on Feb 14, 2022

rm trailing slash from link

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ax3l
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Commits on Jan 25, 2023

Fix Typo
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