docs: updated schema.rs to use the right signature for decimal data t…

…ype in documentation (#1377)

# Description
docs: Minor change in the docs. The documentation says
Decimal(\<scale\>, \<precision\>) but it should be
Decimal(\<precision\>, \<scale\>)

# Related Issue(s)
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- closes #106
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# Documentation

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python/src/schema.rs

@@ -110,7 +110,7 @@ fn python_type_to_schema(ob: PyObject, py: Python) -> PyResult<SchemaDataType> {
 ///  * "binary",
 ///  * "date",
 ///  * "timestamp",
-///  * "decimal(<scale>, <precision>)"
+///  * "decimal(<precision>, <scale>)"
 ///
 /// :param data_type: string representation of the data type
 #[pyclass(module = "deltalake.schema", text_signature = "(data_type)")]