Update: LDAP Injection Prevention Cheat Sheet

[wittjoe1]

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This PR covers issue #1313

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[wittjoe1]

minor changes (spelling, grammar) in

• secrets management cheat sheet
• DOM-based XSS Prevention Cheat Sheet

sorry for pushing them late - i just learnt, i forgot this the last time

updating LDAP injection prevention cheat sheet- this shoult really be validated !