Clarify maximum blob size in language reference #160
Description
The language references on blobs currently say:
The maximum size of a BLOB field is limited to 4GB, regardless of whether the server is 32-bit or 64-bit. (The internal structures related to BLOBs maintain their own 4-byte counters.) For a page size of 4 KB (4096 bytes) the maximum size is lower — slightly less than 2GB.
However, blobs can be a lot larger than 4GB, but with restricted functionality (e.g. OCTET_LENGTH reports incorrect length, seeks don't work beyond 4GB - 1, etc). In addition the maximum size of a blob on page size 4KB is slightly less than 4GB (exact size depends on stream blob or the segment sized used), not slightly less than 2GB.