Update broken definition dbxrefs

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Many definitions have old dbxrefs/links that are broken. Replace with the following and update the definition where indicated:

• ectoderm: UBERON:0000924
• brain: Organ that is the center of the nervous system. It is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing, balance, taste, and smell. UBERON:0000955
• spinal cord: Long, thin, tubular structure made up of nervous tissue that extends from the brainstem to the lumbar region of the vertebral column, and from which the spinal nerves emerge. Wikipedia:Spinal_cord
• skin: The organ covering the body that consists of the dermis and epidermis. UBERON:0002097
• zygote: cell formed by a fertilization event between male and female gametes. Wikipedia:Zygote
• mesoderm: Primary germ layer that is the middle of the embryo's germ layers, between the endoderm and ectoderm. UBERON:0000926
• somite. https://orcid.org/0000-0002-9611-1279
• bottle cell: Early embryonic cell with a bottle or flask shape that is first to migrate inwards at the blastopore during gastrulation. CL:0007020
• endoderm: UBERON:0000925
• tail bud: UBERON:0002533
• respiratory system: Functional system which consists of structures involved in respiration (breathing). UBERON:0001004
• hematological system: DOI:10.1016/B978-0-12-809880-6.00013-8
• esophagus: UBERON:0001043
• stomach: An expanded region of the alimentary tract that is situated between the esophagus and the beginning of the duodenum and produces gastric juices involved in the breakdown of food. Wikipedia:Stomach, https://orcid.org/0000-0002-9611-1279
• tendon: Wikipedia:Tendon
• dermal system: The set of organs forming the outermost layer of the body, comprising the skin and its appendages. Wikipedia:Integumentary_system. (Add related synonym: integumental system.)
• peripheral nervous system: UBERON:0000010
• follicle cell: Wikipedia:Ovarian_follicle
• neural plate: Wikipedia:Neural_plate
• paraxial mesoderm: https://medical-dictionary.thefreedictionary.com/Paraxial+mesoderm
• tail: Wikipedia:Tail
• nostril: UBERON:0005928
• lens transitional zone: https://medical-dictionary.thefreedictionary.com/transitional+zone
• notoplate: https://orcid.org/0000-0002-9611-1279
• oral evagination: https://orcid.org/0000-0002-9611-1279
• notochordal epithelium: DOI:10.1242/dev.1.4.411
• disaggregated/reaggregated ectoderm treated with activin: NCBI:UniGene
• metacarpus, metatarsus: https://www.infovisual.info/en/biology-animal/skeleton-of-a-frog
• hypobranchial head muscle: https://www.britannica.com/science/muscle/Tetrapod-musculature
• m. intermandibularis, m. transversus ventralis II, mm. constrictores branchiales II/III/IV: DOI:10.1242/jcs.s2-81.322.161
• planum hypobranchiale: https://orcid.org/0000-0002-9611-1279
• trabecula cranii: Cartilaginous element comprising paired, rod-shaped cartilages, which develop in the head of the embryo. They are the primordia of the anterior part of the cranial base, and are derived from the cranial neural crest cells. Wikipedia:Trabecular_cartilage (Add related synonym: trabecular cartilage.)
• paired dorsal aorta: https://orcid.org/0000-0002-9611-1279
• skin seromucous gland: https://orcid.org/0000-0002-9611-1279
• tailbud stage: DOI:10.1038/nrg1347

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Completed in XAO version 11.