Documentation: fix \p names that diverged from the code

Fix places where Doxygen documentation uses \p to refer to a parameter
name and where the name used did not match the actual parameter name.

I used the following script to detect problematic cases:
```
perl -w -ne 'if (eof) { $. = 0; } if (m!^/\*\*!) { $in_doc = 1; %param = (); %p = (); } if (m!\*/!) { foreach $name (keys %p) { if (!$param{$name}) { foreach $line (@{$p{$name}}) { print "$ARGV:$line: $name\n" } } } $in_doc = 0; } if ($in_doc) { if (/\\param(?: *\[[^\[\]]*\])? +(\w+)/) { $param{$1} = 1; } foreach (/\\p +\*?(\w+)/) { push @{$p{$1}}, $.; } }' include/psa/*.h
```

This commits fixes all the remaining occurrences under include/psa,
which were just trivial name mismatches.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/psa/crypto_compat.h b/include/psa/crypto_compat.h
index 66e6201..ae09a70 100644
--- a/include/psa/crypto_compat.h
+++ b/include/psa/crypto_compat.h
@@ -313,9 +313,9 @@
  *         number of open keys, the number of open key handles, or available
  *         memory.
  * \retval #PSA_ERROR_DOES_NOT_EXIST
- *         There is no persistent key with key identifier \p id.
+ *         There is no persistent key with key identifier \p key.
  * \retval #PSA_ERROR_INVALID_ARGUMENT
- *         \p id is not a valid persistent key identifier.
+ *         \p key is not a valid persistent key identifier.
  * \retval #PSA_ERROR_NOT_PERMITTED
  *         The specified key exists, but the application does not have the
  *         permission to access it. Note that this specification does not