langchain_chroma[patch]: updated example for get documents with where…

… clause (#26767)

Example updated for vectorstore ChromaDB.

If we want to apply multiple filters then ChromaDB supports filters like
this:
Reference: [ChromaDB
filters](https://cookbook.chromadb.dev/core/filters/)

Thank you.

libs/partners/chroma/langchain_chroma/vectorstores.py

@@ -941,7 +941,7 @@ def get(
         Args:
             ids: The ids of the embeddings to get. Optional.
             where: A Where type dict used to filter results by.
-                   E.g. `{"color" : "red", "price": 4.20}`. Optional.
+                   E.g. `{"$and": [{"color": "red"}, {"price": 4.20}]}` Optional.
             limit: The number of documents to return. Optional.
             offset: The offset to start returning results from.
                     Useful for paging results with limit. Optional.