[flake8-simplify]: combine-if-conditions (#2823)

docs/rules/combine-if-conditions.md

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+# combine-if-conditions (SIM114)
+
+Derived from the **flake8-simplify** linter.
+
+### What it does
+Checks if consecutive `if` branches have the same body.
+
+### Why is this bad?
+These branches can be combine using the python `or` statement
+
+### Example
+```python
+if x = 1:
+    print("Hello")
+elif x = 2:
+    print("Hello")
+```
+
+Use instead:
+```python
+if x = 1 or x = 2
+    print("Hello")
+```

docs/rules/if-with-same-arms.md

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+# if-with-same-arms (SIM114)
+
+Derived from the **flake8-simplify** linter.
+
+### What it does
+Checks for `if` branches with identical arm bodies.
+
+### Why is this bad?
+If multiple arms of an `if` statement have the same body, using `or`
+better signals the intent of the statement.
+
+### Example
+```python
+if x = 1:
+    print("Hello")
+elif x = 2:
+    print("Hello")
+```
+
+Use instead:
+```python
+if x = 1 or x = 2
+    print("Hello")
+```