Answer prose round 2: top_streets says what it returns, and CheckIdentifier's doc opens with what it does

data-import/geo.py

@@ -64,8 +64,8 @@ class Nearest:
 
 
 def top_streets(count, per_locality, column):
-    """count maps (locality, street name) to a count. Per locality, the per_locality names counted most, ties broken by
+    """count maps (locality, street name) to a count. Returns, per locality, rows for the per_locality names counted
-    name, each row holding its count under column."""
+    most, ties broken by name; each row holds its count under column."""
     of = collections.defaultdict(list)
     for (locality, name), n in count.items():
         of[locality].append((n, name))

internal/grammar/identifier.go

@@ -13,8 +13,9 @@ const reservedInIdentifier = ".|({}/[]\""
 
 var reservedList = strings.Join(strings.Split(reservedInIdentifier, ""), " ")
 
-// An identifier names a folder, category, field, column or bound name. CheckIdentifier rejects one
+// CheckIdentifier rejects an identifier that the dot path, {token} and JSON grammars cannot spell,
-// that the dot path, {token} and JSON grammars cannot spell, or that a struct tag cannot read.
+// or that a struct tag cannot read. An identifier names a folder, category, field, column or bound
+// name.
 func CheckIdentifier(name string) error {
 	if name == "" {
 		return fmt.Errorf("%q is empty, which is not a path segment, so List never offers it", name)