Fix whitespace in many administration docs

Many code blocks are 4spaced, and they render in GitLab
without coloring as a result, even though they are
fenced with a language label. If in a list, other items
will render as being in a code block too, even if not
meant to. This fixes all these issues for many admin
docs (part 2)

doc/administration/integration/plantuml.md

@@ -57,9 +57,9 @@ you can change these defaults by editing the `/etc/tomcat7/server.xml` file.
 You need to enable PlantUML integration from Settings under Admin Area. To do
 that, login with an Admin account and do following:
 
- - in GitLab go to **Admin Area**->**Settings**->**Integrations**->**PlantUML**
- - check **Enable PlantUML** checkbox
- - set the PlantUML instance as **PlantUML URL**
+- in GitLab go to **Admin Area**->**Settings**->**Integrations**->**PlantUML**
+- check **Enable PlantUML** checkbox
+- set the PlantUML instance as **PlantUML URL**
 
 ## Creating Diagrams
 
@@ -74,6 +74,7 @@ our AsciiDoc snippets, wikis and repos using delimited blocks:
   Alice -> Bob : Go Away
   ```</pre>
 
+
 - **AsciiDoc**
 
    ```
@@ -111,11 +112,11 @@ diagram delimiters `@startuml`/`@enduml` as these are replaced by the AsciiDoc `
 
 Some parameters can be added to the AsciiDoc block definition:
 
- - *format*: Can be either `png` or `svg`. Note that `svg` is not supported by
+- *format*: Can be either `png` or `svg`. Note that `svg` is not supported by
   all browsers so use with care. The default is `png`.
- - *id*: A CSS id added to the diagram HTML tag.
- - *width*: Width attribute added to the img tag.
- - *height*: Height attribute added to the img tag.
+- *id*: A CSS id added to the diagram HTML tag.
+- *width*: Width attribute added to the img tag.
+- *height*: Height attribute added to the img tag.
 
 Markdown does not support any parameters and will always use PNG format.
 

doc/administration/operations/filesystem_benchmarking.md

@@ -81,16 +81,19 @@ executed, and then read the same 1,000 files.
    ```sh
    mkdir test; cd test
    ```
+
 1. Run the command:
 
    ```sh
    time for i in {0..1000}; do echo 'test' > "test${i}.txt"; done
    ```
+
 1. To benchmark read performance, run the command:
 
    ```sh
    time for i in {0..1000}; do cat "test${i}.txt" > /dev/null; done
    ```
+
 1. Remove the test files:
 
   ```sh

doc/administration/pages/index.md

@@ -395,6 +395,7 @@ Follow the steps below to configure GitLab Pages in a separate server.
    node_exporter['enable'] = false
    gitlab_rails['auto_migrate'] = false
    ```
+
 1. Run `sudo gitlab-ctl reconfigure`.
 1. On `app1` apply the following changes to `/etc/gitlab/gitlab.rb`: