cloud: update limited SQL features for Premium

[Oreoxmt]

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[gemini-code-assist]

Code Review

This pull request updates the limited-sql-features.md file to document the SQL feature limitations and support status for the new TiDB Cloud Premium tier. The review feedback focuses on improving documentation clarity and technical accuracy, including correcting a table classification for metrics_schema, reducing repetition in the IMPORT INTO description, and simplifying the LOAD DATA INFILE entry by removing redundant phrasing.

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[gemini-code-assist]

In the Table column for the metrics_schema database, it should say All tables instead of All databases.

Suggested change

	| `metrics_schema` | All databases | / | Not supported | / |
	| `metrics_schema` | All tables | / | Not supported | / |

References

1. Ensure technical accuracy and terminology consistency by correcting mistakes. ^(link)

[gemini-code-assist]

To avoid unnecessary repetition of the phrase Blocks IMPORT INTO, we can combine the two sentences into a single, more concise sentence.

Suggested change

	| `IMPORT INTO` | / | Blocks `IMPORT INTO` from a local file path. Blocks `IMPORT INTO` statements that use an S3 `EXTERNAL_ID`. | / |
	| `IMPORT INTO` | / | Blocks `IMPORT INTO` from a local file path and statements that use an S3 `EXTERNAL_ID`. | / |

References

1. Avoid unnecessary words and repetition to improve clarity and readability. ^(link)

[gemini-code-assist]

Since LOAD DATA LOCAL INFILE by definition only loads files from the client's local file system, adding from a local file path is redundant. We can simplify this to Blocks LOAD DATA LOCAL INFILE.

Suggested change

	| `LOAD DATA INFILE` | Supports `LOAD DATA LOCAL INFILE`, and `LOAD DATA INFILE` from Amazon S3 or Google Cloud Storage | Blocks `LOAD DATA LOCAL INFILE` from a local file path. | Only supports `LOAD DATA LOCAL INFILE` |
	| `LOAD DATA INFILE` | Supports `LOAD DATA LOCAL INFILE`, and `LOAD DATA INFILE` from Amazon S3 or Google Cloud Storage | Blocks `LOAD DATA LOCAL INFILE`. | Only supports `LOAD DATA LOCAL INFILE` |

References

1. Avoid unnecessary words and repetition to keep the documentation concise. ^(link)