Revert "DOC: bump version numbers"

This reverts commit cbc05f1f.
It was accidently added during merge

CMakeLists.txt

@@ -66,7 +66,7 @@ set(main_project_name ${_OTBModuleMacros_DEFAULT_LABEL})
 #-----------------------------------------------------------------------------
 # OTB version number.
 set(OTB_VERSION_MAJOR "5")
-set(OTB_VERSION_MINOR "3")
+set(OTB_VERSION_MINOR "2")
 set(OTB_VERSION_PATCH "0")
 set(OTB_VERSION_STRING "${OTB_VERSION_MAJOR}.${OTB_VERSION_MINOR}.${OTB_VERSION_PATCH}")