apacheGH-34037: [Python][Docs] Fix Table.drop docstring (apache#34038)

It throws errors in the CI, while I was working on other docstrings:

```
pyarrow.lib.Table.drop
-> pyarrow.lib.Table.drop(self, columns)
PR01: Parameters {'columns'} not documented

pyarrow.lib.Table.drop
-> pyarrow.lib.Table.drop(self, columns)
PR01: Parameters {'columns'} not documented

pyarrow.lib.Table.drop
-> pyarrow.lib.Table.drop(self, columns)
PR01: Parameters {'columns'} not documented

Total number of docstring violations: 3
```

### Rationale for this change

### What changes are included in this PR?

### Are these changes tested?

### Are there any user-facing changes?

* Closes: apache#34037

Lead-authored-by: "Fokko Driesprong <[email protected]>"
Co-authored-by: Joris Van den Bossche <[email protected]>
Co-authored-by: Fokko Driesprong <[email protected]>
Signed-off-by: Joris Van den Bossche <[email protected]>

Author: Fokko

python/pyarrow/table.pxi

@@ -4726,7 +4726,21 @@ cdef class Table(_PandasConvertible):
         return table
 
     def drop(self, columns):
-        """Alias of Table.drop_columns, but kept for backwards compatibility."""
+        """
+        Drop one or more columns and return a new table.
+
+        Alias of Table.drop_columns, but kept for backwards compatibility.
+
+        Parameters
+        ----------
+        columns : str or list[str]
+            Field name(s) referencing existing column(s).
+
+        Returns
+        -------
+        Table
+            New table without the column(s).
+        """
         return self.drop_columns(columns)
 
     def group_by(self, keys):