docs: fix typos in roxygen documentation

[Avicennasis]

Summary

Fixes 8 typos in roxygen documentation. Edits are made in the roxygen comments under R/, and the corresponding man/*.Rd files are updated to match so the tree stays consistent without needing a devtools::document() round-trip. Documentation only - no exported function, argument or object name is changed.

• R/tbl_check_names.R, R/tbl_check_groups.R, R/tbl_check_dimensions.R: the names/groups/dimensions of two object are the same -> ... of two objects are the same (all three titles share the wording, so all three are corrected)
• R/tbl_check_names.R: `tbl_check_names()` and `vec_check_names()` returns a list -> ... return a list (compound subject)
• R/tbl_check_names.R: `tbl_grade_names()` and `vec_grade_names()` returns a failing grade -> ... return a failing grade
• R/vec_check_values.R: Checks that two vectors are contain the same values -> Checks that two vectors contain the same values
• R/tbl_check_column.R: `object` doesn't contain a column named column. -> `object` doesn't contain a column named `column`. (every other bullet in that @section Problems block already code-formats column)
• R/tbl_check_column.R: @param check_levels ... Whether to check that `column` and has the same [factor levels][levels()] -> ... Whether to check that `column` has the same [factor levels][levels()] (stray and; the sibling check_class, check_length, check_values and check_names params all read Whether to check that column has the same ...)

Regenerated man/ files touched: tbl_check_names.Rd, tbl_check_groups.Rd, tbl_check_dimensions.Rd, vec_check_values.Rd, tbl_check_column.Rd.

Note on the singular returns: the other - fn() returns ... bullets across the package have a single function as the subject and are correct as written, so they are deliberately left alone. Only the two lines in tbl_check_names.R have two functions joined by and.

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