Merge pull request #6915 from candlerb/candlerb/libpq-dev

Documentation consistency on installation of libpq-dev(el)

docs/installation/1-postgresql.md

@@ -11,13 +11,13 @@ This section entails the installation and configuration of a local PostgreSQL da
 
     ```no-highlight
     sudo apt update
-    sudo apt install -y postgresql libpq-dev
+    sudo apt install -y postgresql
     ```
 
 === "CentOS"
 
     ```no-highlight
-    sudo yum install -y postgresql-server libpq-devel
+    sudo yum install -y postgresql-server
     sudo postgresql-setup --initdb
     ```
 

docs/installation/3-netbox.md

@@ -18,7 +18,7 @@ Begin by installing all system packages required by NetBox and its dependencies.
 === "CentOS"
 
     ```no-highlight
-    sudo yum install -y gcc python36 python36-devel python3-pip libxml2-devel libxslt-devel libffi-devel openssl-devel redhat-rpm-config
+    sudo yum install -y gcc python36 python36-devel python3-pip libxml2-devel libxslt-devel libffi-devel libpq-devel openssl-devel redhat-rpm-config
     ```
 
 Before continuing with either platform, update pip (Python's package management tool) to its latest release: