[TYPO] Fix number of diagnostic classes

[AlexDenisov]

Fix for small typo:

diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst
index 9d8e978..a76f002 100644
--- a/docs/UsersManual.rst
+++ b/docs/UsersManual.rst
@@ -637,7 +637,7 @@ Diagnostics <cl_diag_formatting>`.
 Diagnostic Mappings
 ^^^^^^^^^^^^^^^^^^^
 
-All diagnostics are mapped into one of these 5 classes:
+All diagnostics are mapped into one of these 6 classes:
 
 -  Ignored
 -  Note


-- 
AlexDenisov
Software Engineer, https://github.com/AlexDenisov
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