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[hotfix][docs] Fix typo #9539

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4 changes: 2 additions & 2 deletions docs/dev/api_concepts.zh.md
Original file line number Diff line number Diff line change
Expand Up @@ -393,7 +393,7 @@ These are valid field expressions for the example code above:
<div data-lang="scala" markdown="1">

In the example below, we have a `WC` POJO with two fields "word" and "count". To group by the field `word`, we just pass its name to the `keyBy()` function.
{% highlight java %}
{% highlight scala %}
// some ordinary POJO (Plain old Java Object)
class WC(var word: String, var count: Int) {
def this() { this("", 0L) }
Expand Down Expand Up @@ -624,7 +624,7 @@ Flink places some restrictions on the type of elements that can be in a DataSet
The reason for this is that the system analyzes the types to determine
efficient execution strategies.

There are six different categories of data types:
There are seven different categories of data types:

1. **Java Tuples** and **Scala Case Classes**
2. **Java POJOs**
Expand Down