Documentation: fix typos in split page table lock description

Signed-off-by: NRolf Eike Beer <eb@emlix.com>
Link: https://lore.kernel.org/r/2338863.uUFqZTUbry@devpool47Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/vm/split_page_table_lock.rst

@@ -32,7 +32,7 @@ There are helpers to lock/unlock a table and other accessor functions:
 
 Split page table lock for PTE tables is enabled compile-time if
 CONFIG_SPLIT_PTLOCK_CPUS (usually 4) is less or equal to NR_CPUS.
-If split lock is disabled, all tables guaded by mm->page_table_lock.
+If split lock is disabled, all tables are guarded by mm->page_table_lock.
 
 Split page table lock for PMD tables is enabled, if it's enabled for PTE
 tables and the architecture supports it (see below).