Docs: Minor changes

HepLean/SpaceTime/LorentzGroup/Boosts.lean

@@ -4,6 +4,7 @@ Released under Apache 2.0 license.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.SpaceTime.LorentzGroup.Orthochronous
+import HepLean.SpaceTime.LorentzGroup.Proper
 import Mathlib.GroupTheory.SpecificGroups.KleinFour
 import Mathlib.Topology.Constructions
 /-!

HepLean/SpaceTime/LorentzGroup/Orthochronous.lean

@@ -169,7 +169,7 @@ lemma mul_not_othchron_of_not_othchron_othchron {Λ Λ' : lorentzGroup} (h : ¬
   rw [zero_zero_mul]
   exact euclid_norm_not_IsFourVelocity_IsFourVelocity h h'
 
-/-- The representation from `lorentzGroup` to `ℤ₂` whose kernal are the Orthochronous elements. -/
+/-- The homomorphism from `lorentzGroup` to `ℤ₂` whose kernal are the Orthochronous elements. -/
 def orthchroRep : lorentzGroup →* ℤ₂ where
   toFun := orthchroMap
   map_one' := by