🐛 TextBox and NumberBox's cursorWidth have erroneous documentation

[jacksonb-cs]

Describe the bug
The default value of cursorWidth for both TextBox and NumberBox is stated to be 2. However:

• TextBox.cursorWidth's default value is 1.
• NumberBox.cursorWidth's default value is 1.5.

Arguably worse yet is the fact that both of these text boxes have different default cursor widths, which leads to visual inconsistency if they are used near one another.

Expected behavior
The documentation should be adjusted to match the real default values, although I recognize that may be tricky considering both fields are relying on macros to copy the docs from the Flutter framework. Furthermore, unless there is a reason for the difference, I believe their default values should match each other, preferably using TextBox's default value as the default for both.

[jacksonb-cs]

Some adjacent things:

• NumberBox.precision says default value is 2, but default value is really null.
• NumberBox.pattern's documentation has a typo: "parttern".

[x-brymo]

textbox fixed?