new committer (src): Jaeyoon Choi (jaeyoon)

Complete steps 1-4 for new committers from the committer's guide:

1. Add myself to doc/shared/authors.adoc
2. Add myself to doc/shared/contrib-committers.adoc
3. Add a news entry
4. Add my PGP key

Reviewed By:	imp (mentor)
Approved by:	imp (mentor)
Differential Revision: https://reviews.freebsd.org/D52569

shared/authors.adoc

@@ -1451,6 +1451,10 @@
 :jadawin-email: jadawin@FreeBSD.org
 :jadawin: {jadawin-name} <{jadawin-email}>
 
+:jaeyoon-name: Jaeyoon Choi
+:jaeyoon-email: jaeyoon@FreeBSD.org
+:jaeyoon: {jaeyoon-name} <{jaeyoon-email}>
+
 :jah-name: Jason A. Harmening
 :jah-email: jah@FreeBSD.org
 :jah: {jah-name} <{jah-email}>

shared/contrib-committers.adoc

@@ -49,6 +49,7 @@
 * {loader}
 * {melifaro}
 * {theraven}
+* {jaeyoon}
 * {davidcs}
 * {jrtc27}
 * {marcus}