Update docs/source/design/concepts/samples_and_specimens.rst

Co-authored-by: Natasha Singh <[email protected]>

docs/source/design/concepts/samples_and_specimens.rst

@@ -7,7 +7,7 @@ Samples and Biospecimens
 Although similarly named, samples and biospecimens refer to different concepts:
 
     * A **sample** represents a physical piece of tissue, blood, or other biologically distinct material taken from a patient.
-    * A **biospecimen** is a part of that sample, e.g. an aliquot of a sample. 
+    * A **biospecimen** is represents a portion or a part of that sample, e.g. an aliquot of a sample. 
 
 While samples and biospecimens are distinct concepts, they share much in common.
 In fact, when the ingest library was first written, its primary target API,