add: notes and warning bloacks

docs/community/styleguide/formatting.md

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+---
+title: Formatting style guide
+description: This style guide explains about using correct formats when writing documenation.
+weight: 
+---
+## Documentation formatting
+
+### Notes and warning blocks
+
+Notes and warning blocks are used to draw attention to important information. Use the following markdown features when necessary:
+
+- Use a clear and concise heading to introduce the note or warning.
+- Use short paragraphs or bullet points to convey the information.
+- Keep the language simple and direct.
+- Use an `>` in markdown to indicate the nature of the note or warning. 
+- Use the following Use the following syntax to apply a style. Currently our documenation supports **Remember** `<Remember>`:
+  * Surround the text with an opening and closing tag.
+  * Use the following syntax to apply a style:
+` <Remember> 
+No need to add a prefix (Remember); the tag automatically provides one
+</Remember>`
+
+The output: 
+
+<Remember> 
+No need to add a prefix (Remember); the tag automatically provides one
+</Remember>