Update trans.md URLs (#2775)

* Update trans.md URLs

* Restore PubMed URLs

* Fix spelling errors in trans.md

---------

Co-authored-by: Deepak <deepakunni3@users.noreply.github.com>

Author: allenbaron

ontology/trans.md

@@ -31,12 +31,12 @@ tags:
 - disease
 tracker: https://github.com/DiseaseOntology/PathogenTransmissionOntology/issues
 usages:
-- description: Methods of trnasmission of human diseases in the DO
+- description: Methods of transmission of human diseases in the DO
   examples:
   - description: methods of transmission of human diseases
-    url: http://www.disease-ontology.org/?id=DOID:12365
-  user: http://www.disease-ontology.org
+    url: https://disease-ontology.org/?id=DOID:12365
+  user: https://disease-ontology.org/
 activity_status: active
 ---
 
-The Pathogen Transmission Ontology describes the tranmission methods of human disease pathogens describing how a pathogen is transmitted from one host, reservoir, or source to another host. The pathogen transmission may occur either directly or indirectly and may involve animate vectors or inanimate vehicles.
+The Pathogen Transmission Ontology describes the transmission methods of human disease pathogens describing how a pathogen is transmitted from one host, reservoir, or source to another host. The pathogen transmission may occur either directly or indirectly and may involve animate vectors or inanimate vehicles.