[Markdown] solutions to problems in some characters displayed as a question format and therefore can not be expected to solve the result of

Problem Description:

• Some characters displayed in Markdown format and therefore can not be expected to result

• For example: a combination of square brackets and parentheses pair can hide a URL link, and when such a combination appear in the text display is easy to cause abnormal.

solve:

• Special characters can be displayed with the need to correct code references marked ``

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