Fixed markdown errors with chars after a code block.

[SeppPenner]

From #701:

I have checked the plural occurences with the following regex'es:

`String()`[a-zA-Z]
`array`[a-zA-Z]
`bool`[a-zA-Z]
`boolean`[a-zA-Z]
`byte`[a-zA-Z]
`char`[a-zA-Z]
`double`[a-zA-Z]
`float`[a-zA-Z]
`int`[a-zA-Z]
`long`[a-zA-Z]
`short`[a-zA-Z]
`size_t`[a-zA-Z]
`string`[a-zA-Z]
`unsigned char`[a-zA-Z]
`unsigned int`[a-zA-Z]
`unsigned long`[a-zA-Z]
`void`[a-zA-Z]
`word`[a-zA-Z]

including all data types from https://www.arduino.cc/reference/en/#variables.

This should fix all the markdown issues with this kind of error.

[SeppPenner]

@per1234 This should be an easy one to merge :)

[per1234]

Thanks!