improve wording

Author: aepanchi

docs/topics/booleans.md

@@ -115,7 +115,9 @@ val d = true xor true   // false
 ## Operator precedence
 
 Logical operators follow precedence rules. They determine how to group variables in
-the absence of parentheses:
+the absence of parentheses. 
+
+The subsequence of execution is: 
 
 1. `!`
 2. `xor`
@@ -195,4 +197,4 @@ fun main() {
 //sampleEnd    
 }
 ```
-{kotlin-runnable="true" kotlin-min-compiler-version="1.3"}
+{kotlin-runnable="true" kotlin-min-compiler-version="1.3"}