Feature/azaytsev/formula fixes (#4601)

* removed redundant tabs

* minor edit

docs/ops/activation/HSigmoid_5.md

@@ -9,9 +9,9 @@
 **Detailed description**: For each element from the input tensor calculates corresponding
 element in the output tensor with the following formula: 
 
-    \f[
-    HSigmoid(x) = \frac{min(max(x + 3, 0), 6)}{6}
-    \f]
+\f[
+HSigmoid(x) = \frac{min(max(x + 3, 0), 6)}{6}
+\f]
 
 The HSigmoid operation is introduced in the following [article](https://arxiv.org/pdf/1905.02244.pdf).
 

docs/ops/activation/HardSigmoid_1.md

@@ -6,9 +6,7 @@
 
 **Short description**: *HardSigmoid* calculates the hard sigmoid function `y(x) = max(0, min(1, alpha * x + beta))` element-wise with given tensor.
 
-**Attributes**:
-
-    No attributes available.
+**Attributes**: No attributes available.
 
 **Inputs**