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[skip ci]Format markdown for chap08_binlog.md (#9319)

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Signed-off-by: ruiyi.jiang <ruiyi.jiang@zilliz.com>
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docs/developer_guides/chap08_binlog.md
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@ -6,7 +6,6 @@ Binlog is stored in a columnar storage format, every column in schema is stored
Timestamp, schema, row id and primary key allocated by system are four special columns.
Schema column records the DDL of the collection.
## Event format
Binlog file consists of 4 bytes magic number and a series of events. The first event must be descriptor event.
@ -29,7 +28,6 @@ Binlog file consists of 4 bytes magic number and a series of events. The first e
+=====================================+=====================================================================+
```
### 8.2 Descriptor Event format
```
@ -64,7 +62,6 @@ Binlog file consists of 4 bytes magic number and a series of events. The first e
+=====================================+=====================================================================|
```
### 8.3 Type code
```
@ -85,7 +82,6 @@ DELETE_EVENT 只能用于 primary key 的 binlog 文件（目前只有按照 pri
CREATE_COLLECTION_EVENT、DROP_COLLECTION_EVENT、CREATE_PARTITION_EVENT、DROP_PARTITION_EVENT 只出现在 DDL binlog 文件
### 8.4 Event data part
```
@ -106,45 +102,38 @@ INSERT_EVENT:
other events are similar with INSERT_EVENT
```
### 8.5 Example
Schema
​ string | int | float(optional) | vector(512)
​ string | int | float(optional) | vector(512)
Request:
​ InsertRequest rows(1W)
​ DeleteRequest pk=1
​ DropPartition partitionTag="abc"
​ InsertRequest rows(1W)
​ DeleteRequest pk=1
​ DropPartition partitionTag="abc"
insert binlogs:
​ rowid, pk, ts, string, int, float, vector 6 files
​ rowid, pk, ts, string, int, float, vector 6 files
​ all events are INSERT_EVENT
​ float column file contains some NULL value
​ all events are INSERT_EVENT
​ float column file contains some NULL value
delete binlogs:
​ pk, ts 2 files
​ pk, ts 2 files
​ pk's events are DELETE_EVENT, ts's events are INSERT_EVENT
​ pk's events are DELETE_EVENT, ts's events are INSERT_EVENT
DDL binlogs:
​ ddl, ts
​ ddl's event is DROP_PARTITION_EVENT, ts's event is INSERT_EVENT
​ ddl, ts
​ ddl's event is DROP_PARTITION_EVENT, ts's event is INSERT_EVENT
C++ interface