33322 Correct typos (cla: yes)

33323 Americanise spellings (cla: yes)

33349 Compatibility pass on flutter/foundation tests for JavaScript compilation. (1) (a: tests, cla: yes, ☸ platform-web)

33350 Compatibility pass on flutter/scheduler tests for JavaScript compilation. (2) (a: tests, cla: yes, ☸ platform-web)

33352 Compatibility pass on flutter/painting tests for JavaScript compilation. (3) (a: tests, cla: yes, ☸ platform-web)

33354 Compatibility pass on flutter/services tests for JavaScript compilation. (4) (a: tests, cla: yes, ☸ platform-web)