Added dnf and yum to linux.

Fixed wording.

Small grammar change.

Fixed capitalization.

Fixed line spacing.

pages/linux/dnf.md

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+# dnf
+
+>Package management utility for RHEL, Feodra, and CentOS (replaces yum)
+
+- Synchronize list of packages and versions available. This should be run first, before running subsequent dnf commands.
+
+`dnf update`
+
+- Install a new package
+
+`dnf install {{package}}`
+
+- Install a new package and assume yes to all questions
+ 
+`dnf -y install {{package}}`
+
+- Remove a package
+
+`dnf remove {{package}}`
+
+- Upgrade installed packages to newest available versions
+
+`dnf upgrade`
+

pages/linux/yum.md

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+# yum
+
+>Package management utility for RHEL, Feodra, and CentOS (for older versions)
+
+- Synchronize list of packages and versions available. This should be run first, before running subsequent yum commands.
+
+`yum update`
+
+- Install a new package
+
+`yum install {{package}}`
+
+- Install a new package and assume yes to all questions (Also works with update, great for automated updates)
+ 
+`yum -y install {{package}}`
+
+- Remove a package
+
+`yum remove {{package}}`
+
+- Upgrade installed packages to newest available versions
+
+`yum upgrade`
+