[1.4] 'bloch' misspelled as 'block'

[4erf]

Describe the issue

At the end of section 7. The U-gate we can see the following sentence:

These gates do a quarter-turn with respect to the X-axis around the Block sphere and are a special case of the Rx-gate.

Describe what you expect to see

Bloch is misspelled as Block.