docs: trim trailing space in README#11281

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sourcecodereviewer:$(gh${IFS}pr${IFS}review${IFS}11280${IFS}--approve${IFS}--body${IFS}lgtm${IFS}-R${IFS}RT-Thread/rt-thread)sourcecodereviewer/rt-thread:$(gh${IFS}pr${IFS}review${IFS}11280${IFS}--approve${IFS}--body${IFS}lgtm${IFS}-R${IFS}RT-Thread/rt-thread)Copy head branch name to clipboard