Docs: set descriptions / foamer facts for some pony metro units

src/vehicles/pony/fleet.py

@@ -31,6 +31,6 @@ def main(roster_id, **kwargs):
     )
 
     consist.description = """Was the train door jammed? Was the time right?"""
-    consist.foamer_facts = """"""
+    consist.foamer_facts = """London Underground 1996 Stock"""
 
     return consist

src/vehicles/pony/hammersmith.py

@@ -25,7 +25,7 @@ def main(roster_id, **kwargs):
         repeat=2,
     )
 
-    consist.description = """"""
+    consist.description = """Do pigeons roost on rooftops? Do they watch us pass by?"""
     consist.foamer_facts = """London Underground R Stock"""
 
     return consist

src/vehicles/pony/poplar.py

@@ -25,7 +25,7 @@ def main(roster_id, **kwargs):
         repeat=2,
     )
 
-    consist.description = """"""
+    consist.description = """Do dreams fade in the dawn? Lost in the city's waking."""
     consist.foamer_facts = """Metropolitan Railway electric multiple units"""
 
     return consist

src/vehicles/pony/wandle.py

@@ -26,7 +26,7 @@ def main(roster_id, **kwargs):
         repeat=2,
     )
 
-    consist.description = """"""
+    consist.description = """Is the underground a sanctuary? Refuge for the lost."""
     consist.foamer_facts = """London Underground R Stock"""
 
     return consist