The specified function may call `syntax-ppss' on any position
before END, but if it calls `syntax-ppss' on some
position and later modifies the buffer on some earlier position,
-then it is its responsability to call `syntax-ppss-flush-cache' to flush
+then it is its responsibility to call `syntax-ppss-flush-cache' to flush
the now obsolete ppss info from the cache.
Note: When this variable is a function, it must apply _all_ the