[docs] Repair Connector Data Type links

docs/content/connectors/mysql-cdc(ZH).md

@@ -695,7 +695,7 @@ $ ./bin/flink run \
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left" style="width:30%;">MySQL type<a href="https://dev.mysql.com/doc/man/8.0/en/data-types.html"></a></th>
+        <th class="text-left" style="width:30%;"><a href="https://dev.mysql.com/doc/man/8.0/en/data-types.html">MySQL type</a></th>
         <th class="text-left" style="width:10%;">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
         <th class="text-left" style="width:60%;">NOTE</th>
       </tr>

docs/content/connectors/mysql-cdc.md

@@ -702,7 +702,7 @@ Data Type Mapping
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left" style="width:30%;">MySQL type<a href="https://dev.mysql.com/doc/man/8.0/en/data-types.html"></a></th>
+        <th class="text-left" style="width:30%;"><a href="https://dev.mysql.com/doc/man/8.0/en/data-types.html">MySQL type</a></th>
         <th class="text-left" style="width:10%;">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
         <th class="text-left" style="width:60%;">NOTE</th>
       </tr>

docs/content/connectors/oceanbase-cdc.md

@@ -425,7 +425,7 @@ Data Type Mapping
     <table class="colwidths-auto docutils">
         <thead>
             <tr>
-                <th class="text-left">OceanBase type<a href="https://www.oceanbase.com/docs/community-observer-cn-10000000000013274"></a></th>
+                <th class="text-left"><a href="https://www.oceanbase.com/docs/community-observer-cn-10000000000013274">OceanBase type</a></th>
                 <th class="text-left">Flink SQL type</th>
                 <th class="text-left">NOTE</th>
             </tr>

docs/content/connectors/oracle-cdc.md

@@ -455,7 +455,7 @@ Data Type Mapping
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left">Oracle type<a href="https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/Data-Types.html"></a></th>
+        <th class="text-left"><a href="https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/Data-Types.html">Oracle type</a></th>
         <th class="text-left">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
       </tr>
     </thead>

docs/content/connectors/postgres-cdc.md

@@ -315,7 +315,7 @@ Data Type Mapping
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left">PostgreSQL type<a href="https://www.postgresql.org/docs/12/datatype.html"></a></th>
+        <th class="text-left"><a href="https://www.postgresql.org/docs/12/datatype.html">PostgreSQL type</a></th>
         <th class="text-left">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
       </tr>
     </thead>

docs/content/connectors/sqlserver-cdc.md

@@ -315,7 +315,7 @@ Data Type Mapping
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left">SQLServer type<a href="https://docs.microsoft.com/en-us/sql/t-sql/data-types/data-types-transact-sql"></a></th>
+        <th class="text-left"><a href="https://docs.microsoft.com/en-us/sql/t-sql/data-types/data-types-transact-sql">SQLServer type</a></th>
         <th class="text-left">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
       </tr>
     </thead>

docs/content/connectors/tidb-cdc.md

@@ -290,7 +290,7 @@ Data Type Mapping
 <table class="colwidths-auto docutils">
     <thead>
       <tr>
-        <th class="text-left">TiDB type<a href="https://dev.tidb.com/doc/man/8.0/en/data-types.html"></a></th>
+        <th class="text-left"><a href="https://dev.tidb.com/doc/man/8.0/en/data-types.html">TiDB type</a></th>
         <th class="text-left">Flink SQL type<a href="{% link dev/table/types.md %}"></a></th>
         <th class="text-left">NOTE</th>
       </tr>