[docs] print headings images added

docs/user/setup/docs.user.setup.print_headings.md

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+{
+	"_label": "Print Headings"
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+---
+Print Headings are the names which you can give to your sales invoices, supplier quotations etc. You can create a list of names for different business communications.
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+You can create print headings from :
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+> Setup > Printing > Print Heading > New Print Heading
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+![Print Heading](img/print-heading1.png)
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+Example of a change in print heading is shown below:
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+![Print Heading](img/print-heading2.png)
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