Classic mode variables: Style update

Signed-off-by: Lynette Miles <[email protected]>

Author: esmerel

administration/configuring-fluent-bit/classic-mode/variables.md

@@ -12,11 +12,13 @@ ${MY_VARIABLE}
 
 When Fluent Bit starts, the configuration reader will detect any request for `${MY_VARIABLE}` and will try to resolve its value.
 
-When Fluent Bit is running under systemd (using the official packages), environment variables can be set in the following files:
-* `/etc/default/fluent-bit` (Debian based system)
-* `/etc/sysconfig/fluent-bit` (Others)
+When Fluent Bit is running under [`systemd`](https://systemd.io/) (using the official packages), environment
+variables can be set in the following files:
 
-These files are ignored if they do not exist.
+- `/etc/default/fluent-bit` (Debian based system)
+- `/etc/sysconfig/fluent-bit` (Others)
+
+These files are ignored if they don't exist.
 
 ## Example
 
@@ -40,10 +42,10 @@ Create the following configuration file \(`fluent-bit.conf`\):
 Open a terminal and set the environment variable:
 
 ```bash
-$ export MY_OUTPUT=stdout
+export MY_OUTPUT=stdout
 ```
 
-> The above command set the 'stdout' value to the variable `MY_OUTPUT`.
+The previous command sets the `stdout` value to the variable `MY_OUTPUT`.
 
 Run Fluent Bit with the recently created configuration file:
 
@@ -58,6 +60,3 @@ Fluent Bit v1.4.0
 [2020/03/03 12:25:25] [ info] [engine] started
 [0] cpu.local: [1491243925, {"cpu_p"=>1.750000, "user_p"=>1.750000, "system_p"=>0.000000, "cpu0.p_cpu"=>3.000000, "cpu0.p_user"=>2.000000, "cpu0.p_system"=>1.000000, "cpu1.p_cpu"=>0.000000, "cpu1.p_user"=>0.000000, "cpu1.p_system"=>0.000000, "cpu2.p_cpu"=>4.000000, "cpu2.p_user"=>4.000000, "cpu2.p_system"=>0.000000, "cpu3.p_cpu"=>1.000000, "cpu3.p_user"=>1.000000, "cpu3.p_system"=>0.000000}]
 ```
-
-As you can see the service worked properly as the configuration was valid.
-