doc ToC ordering

HOCON.md

@@ -22,11 +22,11 @@
       - [Note: Arrays without commas or newlines](#note-arrays-without-commas-or-newlines)
     - [Path expressions](#path-expressions)
     - [Paths as keys](#paths-as-keys)
-    - [Conditional expressions](#conditional-expressions)
     - [Substitutions](#substitutions)
       - [Self-Referential Substitutions](#self-referential-substitutions)
       - [The `+=` field separator](#the--field-separator)
       - [Examples of Self-Referential Substitutions](#examples-of-self-referential-substitutions)
+    - [Conditional expressions](#conditional-expressions)
     - [Includes](#includes)
       - [Include syntax](#include-syntax)
       - [Include semantics: merging](#include-semantics-merging)
@@ -720,23 +720,6 @@ resolving an optional substitution (i.e. the `${?foo}` syntax).
 If `${?foo}` refers to itself then it's as if it referred to a
 nonexistent value.
 
-### Conditional expressions
-
-Conditional expressions allow for a block of configuration to be
-included or omitted based on the value of a substitution.
-
-Example conditional expression:
-
-  - `if [${a} == "a"] { b: true }`
-
-In this case, if the substitution ${a} was equal to the string "a"
-then the object { b: true } would be merged into the object that
-the conditional expression was declared inside. If it was not
-equal to "a" nothing would be merged.
-
-The left hand side substitution cannot be optional. Currently, only equality comparisons are supported. The right hand side
-of the expression can be any string, quoted or unquoted, or a boolean.
-
 #### The `+=` field separator
 
 Fields may have `+=` as a separator rather than `:` or `=`. A
@@ -913,6 +896,23 @@ rather than by the path inside the `${}` expression, because
 substitutions may be resolved differently depending on their
 position in the file.
 
+### Conditional expressions
+
+Conditional expressions allow for a block of configuration to be
+included or omitted based on the value of a substitution.
+
+Example conditional expression:
+
+  - `if [${a} == "a"] { b: true }`
+
+In this case, if the substitution ${a} was equal to the string "a"
+then the object { b: true } would be merged into the object that
+the conditional expression was declared inside. If it was not
+equal to "a" nothing would be merged.
+
+The left hand side substitution cannot be optional. Currently, only equality comparisons are supported. The right hand side
+of the expression can be any string, quoted or unquoted, or a boolean.
+
 ### Includes
 
 #### Include syntax