Fix statement capitalization

just making it consistent with the other items in the list.

Author: neclimdul

spec/00-specification-for-php.md

@@ -183,8 +183,8 @@ is distributed without any warranty.
     - [The `throw` Statement](11-statements.md#the-throw-statement)
   - [The `try` Statement](11-statements.md#the-try-statement)
   - [The `declare` Statement](11-statements.md#the-declare-statement)
-  - [The `echo` statement](11-statements.md#the-echo-statement)
-  - [The `unset` statement](11-statements.md#the-unset-statement)
+  - [The `echo` Statement](11-statements.md#the-echo-statement)
+  - [The `unset` Statement](11-statements.md#the-unset-statement)
 - [Arrays](12-arrays.md#arrays)
   - [General](12-arrays.md#general)
   - [Array Creation and Initialization](12-arrays.md#array-creation-and-initialization)

spec/11-statements.md

@@ -1294,7 +1294,7 @@ declare(encoding = 'ISO-8859-1'); // Latin-1 Western European
 declare(encoding = 'ISO-8859-5'); // Latin/Cyrillic
 ```
 
-## The `echo` statement
+## The `echo` Statement
 
 **Syntax**
 
@@ -1345,7 +1345,7 @@ $v3 = "qqq{$v2}zzz";
 echo "$v3\n";
 ```
 
-## The `unset` statement
+## The `unset` Statement
 
 **Syntax**