fixup: spell psa_encapsulate() correctly

Author: athoelke

doc/crypto/api/library/library.rst

@@ -170,7 +170,7 @@ If the application calls any function that returns a :code:`psa_status_t` result
 
     Initializing this subsystem initializes all registered entropy drivers, and accesses the registered entropy sources.
 
-    Initializing this subsystem is necessary for `psa_generate_random()`, `psa_generate_key()`, `psa_encapsulate_key()`, PAKE operations, and some operations using key pairs.
+    Initializing this subsystem is necessary for `psa_generate_random()`, `psa_generate_key()`, `psa_encapsulate()`, PAKE operations, and some operations using key pairs.
 
     It is guaranteed that the following operations do not to require this subsystem: