Remerge OPS additions after rebase - #1

Remerge OPS additions after rebase

Fix spelling typo and table formatting

Syncing with Master

syncing with PSDocs

updated certificate creation section

Merge with PowerShell/PowerShell-Docs

sync

Syncing from original

UPD 2017-06-22

* Updated Kali Linux Installation and Uninstallation

Updated the Installation and Uninstallation Bash commands for Kali Linux distro to address the issue #2901.

Tested the steps in Kali Linux on Windows Subsystem for Linux (WSL) on the following version:
```sh
$ sudo cat /etc/os-release
PRETTY_NAME="Kali GNU/Linux Rolling"
NAME="Kali GNU/Linux"
ID=kali
VERSION="2018.3"
VERSION_ID="2018.3"
ID_LIKE=debian
ANSI_COLOR="1;31"
HOME_URL="https://www.kali.org/"
SUPPORT_URL="https://forums.kali.org/"
BUG_REPORT_URL="https://bugs.kali.org/"
```

```sh
$ pwsh
PowerShell 6.1.0
Copyright (c) Microsoft Corporation. All rights reserved.

https://aka.ms/pscore6-docs
Type 'help' to get help.

PS /> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      6.1.0
PSEdition                      Core
GitCommitId                    6.1.0
OS                             Linux 4.4.0-43-Microsoft #1-Microsoft Wed Dec 31 14:42:53 PST 2014
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

PS /> Get-Content -Path /etc/os-release
PRETTY_NAME="Kali GNU/Linux Rolling"
NAME="Kali GNU/Linux"
ID=kali
VERSION="2018.3"
VERSION_ID="2018.3"
ID_LIKE=debian
ANSI_COLOR="1;31"
HOME_URL="https://www.kali.org/"
SUPPORT_URL="https://forums.kali.org/"
BUG_REPORT_URL="https://bugs.kali.org/"
```

* Included apt-get update

Added `apt-get update` to update packages list before `apt-get install`

* Removed note for Kali install

* Fixing Dead Link

The link *How to Declare Input Validation Rules* under Remarks, bullet point #1 was pointing to a dead link. I have modified it to point to the most relevant reference page I could find on that topic.

* Update validatelength-attribute-declaration.md