[LLVM] Fix formatting mistakes in Maintainers.md (NFC)

Author: nikic

llvm/Maintainers.md

@@ -76,7 +76,7 @@ [email protected] (email), [fhahn](https://github.com/fhahn) (GitHub)
 #### SandboxVectorizer
 
 Vasileios Porpodas \
-[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub)
+[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub) \
 Jorge Gorbe Moya \
 [email protected] (email), [slackito](https://github.com/slackito) (GitHub)
 
@@ -233,11 +233,11 @@ [email protected] (email), [asl](https://github.com/asl) (GitHub)
 #### NVPTX backend
 
 Justin Holewinski \
-[email protected] (email), [jholewinski](https://github.com/jholewinski) (GitHub)
+[email protected] (email), [jholewinski](https://github.com/jholewinski) (GitHub) \
 Artem Belevich \
-[email protected] (email), [Artem-B](https://github.com/Artem-B) (GitHub)
+[email protected] (email), [Artem-B](https://github.com/Artem-B) (GitHub) \
 Alex MacLean \
-[email protected] (email), [AlexMaclean](https://github.com/AlexMaclean) (GitHub)
+[email protected] (email), [AlexMaclean](https://github.com/AlexMaclean) (GitHub) \
 Justin Fargnoli \
 [email protected] (email), [justinfargnoli](https://github.com/justinfargnoli) (GitHub)
 
@@ -339,7 +339,7 @@ [email protected] (email), [lhames](https://github.com/lhames) (GitHub)
 #### SandboxIR
 
 Vasileios Porpodas \
-[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub)
+[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub) \
 Jorge Gorbe Moya \
 [email protected] (email), [slackito](https://github.com/slackito) (GitHub)