anchors" NOTE

re`document()`s with dev DBI + adjusts one manual `\link{}` in a source file

Resolves:

```
* checking Rd cross-references ... NOTE
Found the following Rd file(s) with Rd \link{} targets missing package
anchors:
  OdbcConnection.Rd: DBIObject-class, DBIDriver-class,
    DBIConnection-class, DBIResult-class, dbBind
  OdbcResult.Rd: DBIObject-class, DBIDriver-class, DBIConnection-class,
    DBIResult-class
  dbConnect-OdbcDriver-method.Rd: dbListTables, dbSendQuery,
    dbColumnInfo, dbFetch
  odbcConnectionColumns.Rd: dbListFields, dbWriteTable
Please provide package anchors for all Rd \link{} targets not in the
package itself and the base packages.
```

Manually documents `@param dbObj` for a few methods rather than inheriting links to classes that don't resolve automatically.