Fix typo (#92)

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 # GA4GH Phenopackets
 
-The [Global Alliance for Genomics and Health](https://www.ga4gh.org/) (GA4GH) Phenopacket standard intendds to support global exchange of computable case-level phenotypic information for all types of disease diagnosis and research. The Phenopacket standard is a freely available, community-driven standard that streamlines exchange and systematic use of phenotypic data, which will enable sophisticated computational analysis of both clinical and genomic information to help improve our understanding of diseases and our ability to manage them.
+The [Global Alliance for Genomics and Health](https://www.ga4gh.org/) (GA4GH) Phenopacket standard intends to support global exchange of computable case-level phenotypic information for all types of disease diagnosis and research. The Phenopacket standard is a freely available, community-driven standard that streamlines exchange and systematic use of phenotypic data, which will enable sophisticated computational analysis of both clinical and genomic information to help improve our understanding of diseases and our ability to manage them.
 
 A Phenopacket represents an individual proband or patient and includes information about the individual such as age (which can be represented in multiple ways including ranges to protect privacy) and sex, any existing disease diagnoses. Almost all elements of a Phenopacket are optional. A simple Phenopacket containing only information about the proband and a list of phenotypic features is all that is required for use cases of Mendelian genomic disease diagnostics. More comprehensive Phenopackets containing additional data about biosamples and treatment may be appropriate for use cases surrounding rare disease, common/complex disease, or cancer.