Add option to clean description html in item description. (#11565)

* [fix] add item settings

* [docs] Item Settings

* [fix] enqueue in item_settings.py

* [refactor] move to stock settings

* [refactor] move to stock settings

erpnext/docs/user/manual/en/stock/item/index.txt

@@ -4,3 +4,4 @@ item-variants
 purchase-details
 reorder
 item-valuation-fifo-and-moving-average
+item-settings

erpnext/docs/user/manual/en/stock/setup/stock-settings.md

@@ -4,4 +4,12 @@ You can set default settings for your stock related transactions here.
 
 <img class="screenshot" alt="Stock Settings" src="/docs/assets/img/stock/stock-settings.png">
 
+### Clean HTML Description
+
+Usually descriptions are copy-pasted from a website or Word / PDF file and they contain a lot of embedded style. This messes up the Print view of your invoices or quotes.
+
+To fix this, you can check "Convert Item Description to Clean HTML" in Stock Settings. This will ensure that when you save your Items, their descriptions will be cleaned up.
+
+If you want control your description views and llow any HTML to be embedded, you can uncheck this property.
+
 {next}