Misleading documentation note for NC_FORMATX_NCZARR

[sval-dev]

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The documentation for the NC_FORMATX_NCZARR states that it was "Added in version 4.3.1", however that is not accurate.
Instead, NC_FORMATX_ZARR was added in 4.3.1, and then the NC_FORMATX_ZARR symbol was renamed to NC_FORMAT_NCZARR released as part of 4.8.0 (renamed in 59e04a).

This issue surfaced since version 1.7.1post2 of the python module uses this symbol, and version 4.7.0 of the C library was on the system, but we got:
external/nc_complex/src/nc_complex.c:637:21: error: ‘NC_FORMATX_NCZARR’ undeclared (first use in this function)

Looking up the symbol suggested it was introduced in 4.3.1, and given that 4.7.0 was on the system led to some confusion.

[WardF]

Thanks! I will update the documentation to reflect this!