MNT: Update global CDF attribute metadata (#747)

Per discussions at the Science Team Meeting and looking at previous
data releases from past missions.

imap_processing/cdf/config/imap_default_global_cdf_attrs.yaml

@@ -1,8 +1,17 @@
-Project: STP>Solar-Terrestrial Physics
+# Reference for sections: https://spdf.gsfc.nasa.gov/istp_guide/gattributes.html
+# Reference from IBEX: https://spdf.gsfc.nasa.gov/pub/software/cdawlib/0SKELTABLES/ibex_h3_ena_lo_r08_omni_f3-gdf-maps_5yr_00000000_v01.skt
+Project: STP>Solar Terrestrial Probes
 Source_name: IMAP>Interstellar Mapping and Acceleration Probe
 Discipline: Solar Physics>Heliospheric Physics
-# TODO: CDF docs say this value should be IMAP
-Mission_group: IMAP>Interstellar Mapping and Acceleration Probe
-PI_name: Dr. David J. McComas
-PI_affiliation: Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, NJ 08540
+Mission_group: IMAP
+PI_name: Prof. David J. McComas
+PI_affiliation: Princeton University
 File_naming_convention: source_descriptor_datatype_yyyyMMdd_vNNN
+Acknowledgement: >
+  Please acknowledge the IMAP Mission Principal Investigator, Prof. David J. McComas of Princeton University.
+Rules_of_use: >
+  All IMAP data products are publicly released and citable for use in publications.
+  Please consult the IMAP team publications and personnel for further details
+  on production, processing, and usage of these data.
+LINK_TITLE: IMAP The Interstellar Mapping and Acceleration Probe
+HTTP_LINK: https://imap.princeton.edu/

imap_processing/tests/cdf/test_imap_cdf_manager.py

@@ -14,15 +14,15 @@ def test_add_instrument_global_attrs():
     # Testing data loaded in
     imap_instrument = imap_cdf_manager.get_global_attributes("imap_test_T1_test")
     assert imap_instrument["Data_type"] == "T1_test-one>Test-1 test one"
-    assert imap_instrument["Project"] == "STP>Solar-Terrestrial Physics"
+    assert imap_instrument["Project"] == "STP>Solar Terrestrial Probes"
 
     # Testing reloading data
     imap_cdf_manager.add_instrument_global_attrs("instrument2")
 
     # Testing data carried over, and overwritten
     instrument2_instrument = imap_cdf_manager.get_global_attributes("imap_swe_l1a_sci")
     assert instrument2_instrument["Data_type"] == "L1A_SCI>Level-1A Science data"
-    assert instrument2_instrument["Project"] == "STP>Solar-Terrestrial Physics"
+    assert instrument2_instrument["Project"] == "STP>Solar Terrestrial Probes"
 
 
 @mock.patch(