STRALGO LCS sytanx spec not accurate

[patpatbear]

currently STRALGO LCS syntax spec is:

STRALGO LCS [KEYS ...] [STRINGS ...] [LEN] [IDX] [MINMATCHLEN <len>] [WITHMATCHLEN]

which IMHO is not accurate, and might be confusing:

• KEYS ..., STRINGS ... seems like the LCS algo can accept arbitary number of KEY or STRING
• [KEYS ...] [STRINGS ...] seems like LCS can accept either KEYS, STRINGS , or both or neither

I suggest the one used in the source code comment:

STRALGO LCS [IDX] [MINMATCHLEN <len>] [WITHMATCHLEN]  STRINGS <string> <string> | KEYS <keya> <keyb>