Mintlify deployment failed after #5123 merged because docs/changelog/sdk.mdx
contained naked `<5s` text. MDX treats `<` as a JSX tag opener, but `5` is
not a valid identifier-start character, so the parser errors:
"Failed to parse page content at path changelog/sdk.mdx: Unexpected
character `5` (U+0035) before name, expected a character that can
start a name, such as a letter, `$`, or `_`"
Replace `in <5s` with `in under 5 seconds`. Other `<...>` patterns in the
entry (e.g. `<name>`, `<email>`, `<their-email>`) are all inside backticks
which Mintlify treats as literal code spans, so they don't trigger the
JSX parser.