sql: remove unnecessary 'copy' from FLUSH PRIVILEGES description

[yahonda]

What is changed, added or deleted? (Required)

Align the FLUSH PRIVILEGES description with MySQL documentation. Changed:

• reload the in-memory copy of privileges from the privilege tables
• reload the grant tables into memory

MySQL's own documentation at https://dev.mysql.com/doc/refman/8.4/en/privilege-changes.html uses reload the grant tables without copy. TiDB documentation should follow the same concise style.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• Other reference link(s): https://dev.mysql.com/doc/refman/8.4/en/privilege-changes.html

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch

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[gemini-code-assist]

Code Review

This pull request simplifies the description of the FLUSH PRIVILEGES statement by changing "in-memory copy of privileges" to "in-memory privileges". The reviewer suggested further simplifying the text by removing "in-memory" entirely to avoid unnecessary words, which aligns with the style guide.

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