According to ISO/IEC 27001:2022, clause 7.5, an organization is required to maintain documented information to support the operation of its processes and to have confidence that the processes are being carried out as planned. This includes documenting the information security policy, the scope of the ISMS, the risk assessment and treatment methodology, the statement of applicability, the risk treatment plan, the information security objectives, and the results of monitoring, measurement, analysis, evaluation, internal audit, and management review. However, the standard does not specify the level of detail or the format of the documented information, as long as it is suitable for the organization's needs and context. Therefore, documenting each security control that is implemented by describing their functions in detail is not a violation of the standard, but it may not be the most efficient or effective way to document the ISMS. Documenting each security control separately may make it harder to review, update, and communicate the documented information, and may also create unnecessary duplication or inconsistency. A better approach would be to document the processes and activities that involve the use of security controls, and to reference the relevant controls from Annex A or other sources. This way, the documented information would be more aligned with the process approach and the Plan-Do-Check-Act cycle that the standard promotes.
References:
* ISO/IEC 27001:2022, Information security, cybersecurity and privacy protection - Information security management systems - Requirements, clauses 4.3, 5.2, 6.1, 6.2, 7.5, 8.2, 8.3, 9.1, 9.2, 9.3, and Annex A
* ISO/IEC 27001:2022 Lead Implementer objectives and content, 4 and 5

Explanation
According to the ISO/IEC 27001:2022 standard, a performance indicator is "a metric that provides information about the effectiveness or efficiency of an activity, process, system or organization" (section 3.35). A performance indicator should be measurable, relevant, achievable, realistic and time-bound (SMART). In this case, the percentage of employees who passed the exam is a performance indicator that measures the effectiveness of the information security awareness and training sessions. It shows how well the sessions achieved their intended learning outcomes and how well the employees understood the information security concepts and practices.
References:
ISO/IEC 27001:2022, Information security, cybersecurity and privacy protection - Information security management systems - Requirements1 ISO/IEC 27001 Lead Implementer Info Kit Key performance indicators for an ISO 27001 ISMS2