fix logical vs relational operators

[chloevdb]

https://www.geeksforgeeks.org/r-language/r-operators/

the table in logical section technically inlcudes a mix of relational and logical operators. and the text describes them all as logical operators but this section should all be relational operators

https://genomicsaotearoa.github.io/Introduction-to-R/01-r-basics/#logical-subsetting