update: added additional note fields (#29551)

* fix: corrected placement of notes

Some "note" fields were preemptive in their placement; I corrected their placement to be in more appropriate locations.

* update: added additional note fields

Added some additional "note" fields to assist those who are reading through the PHP documentation.

* fix: formatting of escape sequence examples

The formatting was a bit jumbled, so I cleaned up the formatting of the escape sequence.

* update: improved examples

I added a new example to demonstrate the use of a "break" statement in a while loop, as well as numbered each example.

* update: add clarifying statement

I added a note at the end of the description, with the goal of being a bit more explicit in terms of what the "continue" statement does.

guide/english/php/if-else-statement/index.md

@@ -16,7 +16,7 @@ If/Else is a conditional statement where depending on the truthiness of a condit
     statement2;
   }
 ```
-> **Note:** The `else` statement is optional.
+> **Note:** You can nest as many statements in an "if" block as you'd like; you are not limited to the amount in the examples.
 ## If/Else Statement
 
 ```
@@ -30,7 +30,7 @@ If/Else is a conditional statement where depending on the truthiness of a condit
     statement4;
   }
 ```
-> **Note:** `elseif` should always be written as one word.
+> **Note:** The `else` statement is optional.
 ## If/Elseif/Else Statement
 
 ```
@@ -46,6 +46,7 @@ If/Else is a conditional statement where depending on the truthiness of a condit
     statement5;
   }
 ```
+> **Note:** `elseif` should always be written as one word.
 ## Nested If/Else Statement
 
 ```
@@ -87,6 +88,7 @@ For instance:
     echo 'One condition is true, and one condition is false!';
   }
 ```
+> **Note:** It's a good practice to wrap individual conditions in parens when you have more than one (it can improve readability).
 
 ## Ternary Operators