*: update some sentences. (#5346)

pingcap · Apr 15, 2021 · 568da86 · 568da86
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diff --git a/error-codes.md b/error-codes.md
@@ -98,7 +98,7 @@ TiDB is compatible with the error codes in MySQL, and in most cases returns the
 
 * Error Number: 8027
 
-    The table schema version is outdated. TiDB uses the F1 online schema change algorithm to execute DDL statements. When the table schema version of the TiDB server is earlier than that of the entire system, this error is returned if you execute a SQL statement.
+    The table schema version is outdated. TiDB uses the online schema change algorithm to execute DDL statements. When the table schema version of the TiDB server is earlier than that of the entire system, this error is returned if you execute a SQL statement.
 
     When this error occurs, check the network between the TiDB server and the PD Leader.
 

diff --git a/sql-statements/sql-statement-admin.md b/sql-statements/sql-statement-admin.md
@@ -194,7 +194,7 @@ admin show ddl jobs 5 where state!='synced' and db_name='test';
 * `JOB_TYPE`: the type of the DDL operations.
 * `SCHEMA_STATE`: the current state of the schema. If the `JOB_TYPE` is `add index`, it is the state of the index; if the `JOB_TYPE` is `add column`, it is the state of the column; if the `JOB_TYPE` is `create table`, it is the state of the table. The common states include:
     * `none`: it indicates not existing. When the `drop` or `create` operation fails and rolls back, it usually becomes the `none` state.
-    * `delete only`, `write only`, `delete reorganization`, `write reorganization`: these four states are intermediate states. For details, see the paper [Online, Asynchronous Schema Change in F1](https://static.googleusercontent.com/media/research.google.com/zh-CN//pubs/archive/41376.pdf). These states are not visible in common operations, because the conversion from the intermediate states is so quick. You can see the `write reorganization` state only in `add index` operations, which means that the index data is being added.
+    * `delete only`, `write only`, `delete reorganization`, `write reorganization`: these four states are intermediate states. These states are not visible in common operations, because the conversion from the intermediate states is so quick. You can see the `write reorganization` state only in `add index` operations, which means that the index data is being added.
     * `public`: it indicates existing and usable. When operations like `create table` and `add index/column` are finished, it usually becomes the `public` state, which means that the created table/column/index can be normally read and written now.
 * `SCHEMA_ID`: the ID of the database on which the DDL operations are performed.
 * `TABLE_ID`: the ID of the table on which the DDL operations are performed.