So, the new line being kicked out after the
<li> in wp_nav_menu was causing a space between my menu items. I am using a background color change on hover that first pointed out the space.
I have discovered that I can edit the nav-menu-template file in wp-includes and remove that /n on line 106.
My question: will that change stick when WordPress next upgrades? Is there a way that I can address this through my child theme functions file instead of editing nav-menu-template?