Cosh revise. (#6516)

docs/ops/arithmetic/Cosh_1.md

@@ -4,33 +4,29 @@
 
 **Category**: Arithmetic unary operation
 
-**Short description**: *Cosh* performs element-wise hyperbolic cosine operation with given tensor.
+**Short description**: *Cosh* performs element-wise hyperbolic cosine operation on a given input tensor.
 
-**Attributes**:
-
-    No attributes available.
-
-**Inputs**
-
-* **1**: An tensor of type *T*. **Required.**
-
-**Outputs**
-
-* **1**: The result of element-wise cosh operation. A tensor of type *T*.
-
-**Types**
-
-* *T*: any numeric type.
-
-*Cosh* does the following with the input tensor *a*:
+**Detailed description**: *Cosh* performs element-wise hyperbolic cosine (cosh) operation on a given input tensor, based on the following mathematical formula:
 
 \f[
 a_{i} = cosh(a_{i})
 \f]
 
-**Examples**
+**Attributes**: *Cosh* operation has no attributes.
 
-*Example 1*
+**Inputs**
+
+* **1**: A tensor of type *T* and arbitrary shape. **Required.**
+
+**Outputs**
+
+* **1**: The result of element-wise *Cosh* operation. A tensor of type *T* and the same shape as the input tensor.
+
+**Types**
+
+* *T*: any numeric type.
+
+**Example**
 
 ```xml
 <layer ... type="Cosh">