Description of problem:

$ more /lib/systemd/system/vncserver@.service
  # The vncserver service unit file
  #
  # Quick HowTo:
  # 1. Copy this file to /etc/systemd/system/vncserver@.service
  # 2. Edit <USER> and vncserver parameters appropriately
  #   ("runuser -l <USER> -c /usr/bin/vncserver %i -arg1 -arg2")
  # 3. Run `systemctl daemon-reload`
  # 4. Run `systemctl enable vncserver@:<display>.service`


In step 2. of comment section, actually 2 lines need to be modified instead of just the first line

("runuser -l <USER> -c /usr/bin/vncserver %i -arg1 -arg2")

It should be 

ExecStart=/sbin/runuser -l USER -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/home/USER/.vnc/%H%i.pid

Please update the Quick HowTo in comments to be consistent with RHEL documentation (https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/ch-TigerVNC.html).

Version-Release number of selected component (if applicable):
tigervnc-server-1.3.1-3.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. N.A.

Actual results:
The vncserver configuration file suggest to modify <USER> in only one line. 
"runuser -l <USER> -c /usr/bin/vncserver %i -arg1 -arg2"

Expected results:
The vncserver configuration file should suggest to modify <USER> in following two lines:

ExecStart=/sbin/runuser -l USER -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/home/USER/.vnc/%H%i.pid