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Update docs/architecture/psa-thread-safety/psa-thread-safety.md

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Co-authored-by: Paul Elliott <62069445+paul-elliott-arm@users.noreply.github.com>
Signed-off-by: Ryan Everett <ryan.everett@arm.com>
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docs/architecture/psa-thread-safety/psa-thread-safety.md
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@ -147,6 +147,8 @@ There are two `psa_global_data_t` structs, each with a single instance `global_d
A deadlock would occur if a thread attempts to lock a mutex while already holding it. Functions which need to be called while holding the global mutex have documentation to say this.
To avoid performance degradation, functions must hold mutexes for as short a time as possible. In particular, they must not start expensive operations (eg. doing cryptography) while holding the mutex.
#### Key slots