Update 'Sections'

Sections.md

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+Sections start with a name token that is four letters long, and determines what
+kind of section it is. It then has a permission token, and then a name which
+defines the name of the section. There may be more tokens after the name
+depending on what type of section it is. If the section's information does not
+fit on one line, it will have an indented block underneath it with its content.
+
+Here is a simple data section to illustrate how sections are written:
+
+```
+data ro someValue:{Int 4}
+	3948 2934
+	39 289
+```
+
+This is a data section whose value is read-only, is named someValue, and is an
+array of integers with a length of 4. Its elements are initialized in the
+indented block below.