are you referring to this
https://www.fidelity.com/bin-public/060_www_fidelity_com/documents/taxes/TY24GSESupplementalLetter.p...
everything should be covered but MM fund symbols are not all listed ("Various") you have to look up by name. But FDRXX from your original question is there and listed as 57.19% which will include certain agencies such as FHLB which are state exempt, but Fannie, Freddie and GNMA are usually taxable. Vanguard equivalent has a useful footnote as to what usually qualifies as US Gov Obligation:
Investments in U.S. government obligations may include the following: Federal Farm Credit Banks, Federal Home Loan Banks, the Student Loan Marketing Association, the Tennessee Valley Authority, the U.S. Treasury Department (bonds, notes, bills, certificates, and savings bonds), and certain other U.S. government obligations. GNMA, FNMA, Freddie Mac, repurchase agreements (including those that involve U.S. government obligations), and certain other securities are generally subject to state and local taxes.
https://investor.vanguard.com/content/dam/retail/publicsite/en/documents/taxes/USGO_012025.pdf
