documentation updates to fms_diag_object.F90 #785

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	10m 40s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	10m 11s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	10m 41s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	12m 7s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	10m 57s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	11m 17s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	10m 56s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	10m 23s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	10m 25s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	10m 13s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	10m 45s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	10m 11s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	4m 34s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	5m 13s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	5m 19s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	3m 54s
	2h 27m 46s

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