fix typo on guardrails docs

[DMarinhoCodacy]

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🚧 To do

• If relevant, include the Jira issue key at the end of the pull request title
• Perform a self-review of the changes
• Fix any issues reported by the CI/CD

[github-actions]

Overall readability score: 52.92 (🟢 +0)

File	Readability
codacy-guardrails-faq.md	57.82 (🟢 +0.2)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
codacy-guardrails-faq.md	57.82	48.2	10.58	10.8	11.94	8.14
	🟢 +0.2	🟢 +0.11	🟢 +0.01	🟢 +0.1	🟢 +0.06	🔴 -0.02

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	52.92	42.78	10.99	12.73	12.62	8
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less