[swift/en] update Swift intro with current links and future-proof language #5342
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Remove outdated Swift Programming Language book link (Swift 5.7)
Update documentation URL to current docs.swift.org location
Replace specific OS list with "all Apple operating systems"
Add mention of cross-platform support
I solemnly swear that this is all original content of which I am the original author
Pull request title is prepended with
[language/lang-code]
(example[python/fr]
for Python in French or[java]
for multiple Java translations)Pull request touches only one file (or a set of logically related files with similar changes made)
Content changes are aimed at intermediate to experienced programmers (this is a poor format for explaining fundamental programming concepts)