[FLINK-39698][docs] Fix incorrect content in SQLServer CDC connector documentation

[arvindKandpal-ksolves]

What is the purpose of the change

This Pull Request addresses the documentation issues reported in FLINK-39698 for the SQLServer CDC connector.

Brief change log

• Updated Limitation Section: Added a note clarifying that the limitation regarding checkpointing during snapshot scanning only applies when the incremental snapshot framework is not enabled (scan.incremental.snapshot.enabled is false).
• Fixed Data Type Mapping: Corrected the Flink SQL type mapping for SQL Server's numeric type from NUMERIC to DECIMAL(p, s).
• Applied these changes to both the English (content/docs/...) and Chinese (content.zh/docs/...) documentation files to keep them in sync.

Verifying this change

This change is a documentation update and does not require new tests.

• Verified locally by checking the markdown format.
• Both English and Chinese documentation files have been updated consistently.

[yuxiqian]

+1. Thanks for the quick fix!