Please document relevance of space servers

[xrow]

We had been looking at this line and we where wondering if there is the need to improve this line

s2i-php-container/7.3/s2i/bin/run

Line 37 in 80ac275

export HTTPD_MAX_SPARE_SERVERS=$((HTTPD_START_SERVERS+10))

.

The start servers are increased by +10. The value seems to be random and maybe not correct if you handle tiny max workers (The setting might be 12). I would a happy if you could add more information on this topic.