chore(docs): fix comments that do not start with the name of the exported element. (#20906)

math/dec.go

@@ -896,7 +896,7 @@ func (d *LegacyDec) UnmarshalAmino(bz []byte) error { return d.Unmarshal(bz) }
 
 // helpers
 
-// test if two decimal arrays are equal
+// LegacyDecsEqual return true if two decimal arrays are equal.
 func LegacyDecsEqual(d1s, d2s []LegacyDec) bool {
 	if len(d1s) != len(d2s) {
 		return false

math/int.go

@@ -521,7 +521,7 @@ func (i *Int) Size() int {
 func (i Int) MarshalAmino() ([]byte, error)   { return i.Marshal() }
 func (i *Int) UnmarshalAmino(bz []byte) error { return i.Unmarshal(bz) }
 
-// intended to be used with require/assert:  require.True(IntEq(...))
+// IntEq intended to be used with require/assert:  require.True(IntEq(...))
 func IntEq(t *testing.T, exp, got Int) (*testing.T, bool, string, string, string) {
 	t.Helper()
 	return t, exp.Equal(got), "expected:\t%v\ngot:\t\t%v", exp.String(), got.String()