docs: remove empty section's title

Author: kenjis

user_guide_src/source/changelogs/v4.3.3.rst

@@ -16,18 +16,6 @@ SECURITY
 - **Text Helper:** The :php:func:`random_string()` type **alpha**, **alnum**,
   **numeric** and **nozero** are now cryptographically secure.
 
-BREAKING
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-Message Changes
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-Changes
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-Deprecations
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 Bugs Fixed
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