Update ontology-documentation.md

_docs/ontology-documentation.md

@@ -16,7 +16,8 @@ redirect_from:
 The Gene Ontology (GO) is a structured, standardized representation of biological knowledge. GO descibes concepts (also known as terms, or formally, *classes*) that are connected to each other via formally defined [relations](/docs/ontology-relations/). Elements of GO terms are described [here](/docs/ontology/). 
 The GO is designed to be species-agnostic, to enable the annotation of gene products across the entire tree of life. The computational framework ofthe GO enables consistent genes annotation, comparison of functions across organisms, and integration of knowledge across diverse biological databases. 
 
-The GO is organized in three *aspects*: 
+# GO aspects
+The GO is organized in three *aspects*
 
 |------------------|-------------|
 | **Molecular Function** | Molecular-level activities performed by gene products, such as "catalysis" or "transcription regulator activity". GO molecular function terms represent activities rather than the entities (molecules or complexes) that perform the actions, and do not specify where, when, or in what context the action takes place. Molecular functions generally correspond to activities that can be performed by individual gene products (*i.e.* a protein or RNA), but some activities are performed by molecular complexes composed of multiple gene products. Examples of broad functional terms are *[catalytic activity](http://amigo.geneontology.org/amigo/term/GO:0003824){:target="blank"}* and *[transporter activity](http://amigo.geneontology.org/amigo/term/GO:0005215){:target="blank"}*; examples of narrower functional terms are *[adenylate cyclase activity](http://amigo.geneontology.org/amigo/term/GO:0004016){:target="blank"}* or *[insulin receptor activity](http://amigo.geneontology.org/amigo/term/GO:0005009){:target="blank"}*. To avoid confusion between gene product names and their molecular functions, GO molecular functions are appended with the word "activity" (a *protein kinase* would have the GO molecular function *protein kinase activity*).