Correction to migration guide entry wording

Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
diff --git a/docs/3.0-migration-guide.d/remove_ssl_record_checking.md b/docs/3.0-migration-guide.d/remove_ssl_record_checking.md
index 91f6f7e..203e740 100644
--- a/docs/3.0-migration-guide.d/remove_ssl_record_checking.md
+++ b/docs/3.0-migration-guide.d/remove_ssl_record_checking.md
@@ -4,10 +4,10 @@
 This change does not affect users who use the default config.h, as the
 option MBEDTLS_SSL_RECORD_CHECKING was already on by default.
 
-This option was added only to control compilation of one function
-(mbedtls_ssl_check_record()) used in DTLS to check a buffer's validity and
-authenticity. Switching it off poses a security risk.
+This option was added only to control compilation of one function,
+mbedtls_ssl_check_record(), which is only useful in some specific cases, so it
+was made optional to allow users who don't need it to save some code space.
+However, the same effect can be achieve by using link-time garbage collection.
 
-For users who changed the default setting of the option there is no real path
-of migration.
-
+Users who changed the default setting of the option need to change the config/
+build system to remove that change.
\ No newline at end of file