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[skip e2e] Add note for design doc (#13936)

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Signed-off-by: yhmo <yihua.mo@zilliz.com>
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docs/design_docs/segcore/basic_types.md
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# Glossary
- `Collection`: Data table containing multiple Segments
- `Segment`: The memory structure of storing a piece of data which supports concurrent insertion, deletion, query, index loading, monitoring and statistics
- `Collection`: Data table containing multiple Segments.
- `Segment`: The memory structure of storing a piece of data which supports concurrent insertion, deletion, query, index loading, monitoring and statistics.
- `Schema`: Definition of collection data format, including
- `vector<FieldMeta>`: Order list of FieldMeta
- `isAutoId`: If set to True , the default primary field is `RowId` and it is auto-generated
- `primaryKey`: (When `isAutoId = False`) Specify primary key field
- `vector<FieldMeta>`: Order list of FieldMeta.
- `isAutoId`: If set to True , the default primary field is `RowId` and it is auto-generated.
- `primaryKey`: (When `isAutoId = False`) Specify primary key field.
- `FieldMeta`: Field properties, including
- `DataType`: Data type, including Int8...Int64, Float, Double, FloatVector, BinaryVector and String later
- `Dim`: (When dataType is vector) Type vector dimension
- `metric_type`: (When dataType is vector type, optional) The metric type corresponding to this vector is related to the small-batch index and can be empty
- `FieldName`: Column name
- `FieldId`: Unique number of the column
- (hidden) `FieldOffset`: Which is the subscript of `vector<Field>` in the schema. The internal calculation of segcore is basically based on field offset
- `Span`: Similar to STD::span. It supports vector type of data and can be implicitly converted to `SpanBase` for interface overwrite
- `DataType`: Data type, including Int8...Int64, Float, Double, FloatVector, BinaryVector and String later.
- `Dim`: (When dataType is vector) Type vector dimension.
- `metric_type`: (When dataType is vector type, optional) The metric type corresponding to this vector is related to the small-batch index and can be empty.
- `FieldName`: Column name.
- `FieldId`: Unique number of the column.
- (hidden) `FieldOffset`: Which is the subscript of `vector<Field>` in the schema. The internal calculation of segcore is basically based on field offset.
- `Span`: Similar to STD::span. It supports vector type of data and can be implicitly converted to `SpanBase` for interface overwrite.