fix docs

Author: fang-xing-esql

docs/reference/query-languages/esql/esql-multi-index.md

@@ -137,9 +137,9 @@ FROM events_*
 
 ### Date and date_nanos union type [esql-multi-index-date-date-nanos-union]
 
-When the type of an {{esql}} field is a *union* of `date` and `date_nanos` across different indices, {{ES|QL}} automatically casts all values to the `date_nanos` type during query execution. This implicit casting ensures that all values are handled with nanosecond precision, regardless of their original type. As a result, users can write queries against such fields without needing to perform explicit type conversions, and the query engine will seamlessly align the types for consistent and precise results.
+When the type of an {{esql}} field is a *union* of `date` and `date_nanos` across different indices, {{esql}} automatically casts all values to the `date_nanos` type during query execution. This implicit casting ensures that all values are handled with nanosecond precision, regardless of their original type. As a result, users can write queries against such fields without needing to perform explicit type conversions, and the query engine will seamlessly align the types for consistent and precise results.
 
-For example, if the `@timestamp` field is mapped as `date` in one index and `date_nanos` in another, {{ES|QL}} will automatically treat all `@timestamp` values as `date_nanos` during query execution. This allows users to write queries that utilize the `@timestamp` field without encountering type mismatch errors, ensuring accurate time-based operations and comparisons across the combined dataset.
+For example, if the `@timestamp` field is mapped as `date` in one index and `date_nanos` in another, {{esql}} will automatically treat all `@timestamp` values as `date_nanos` during query execution. This allows users to write queries that utilize the `@timestamp` field without encountering type mismatch errors, ensuring accurate time-based operations and comparisons across the combined dataset.
 
 **index: events_date**