Fix a document error. (apache#3084)

CODE_OF_CONDUCT.md

@@ -23,7 +23,7 @@
  - Return values are named with `result`; Variables in the loop structure are named with `each`; Replace `each` with `entry` in map.
  - Exceptions when catch are named with `ex`; Exceptions when catch but do nothing are named with `ignored`.
  - Name property files with camel-case and lowercase first letters.
- - Have constants on the left and variable on the right in `=` and `equals` conditional expressions; Have variable on the left and constants on the right in `greater than` and `less than` conditional expressions.
+ - Have constants on the left and variable on the right in `==` and `equals` conditional expressions; Have variable on the left and constants on the right in `greater than` and `less than` conditional expressions.
  - Use `LinkedList`  in priority. Use `ArrayList` for use index to get element only.
  - Use capacity based `Collection` such as `ArrayList`, `HashMap` must indicate initial capacity to avoid recalculate capacity.
  - Design class as `final` class expect abstract class for extend.