Update why-our-startup-failed.md

As per (hopefully your?) post at https://news.ycombinator.com/item?id=7700198, some edits :)
- failure should be plural
- recon -> reckon
- neither -> nor. Neither belongs in front, like "he was neither convincing nor able to sell it"
- stewart -> steward
- By symptoms ("Many symptoms accumulated along the weeks"), do you maybe mean red flags (ie warning signs)? Or are you going for symptoms of your startup choking?
- page should be singular (6 web pages vs 6 page website)
- information is a collective noun (like fish - you don't need the "s" to make it plural)
- "I thought the product we made was worth the customers we were targeting" - do you mean it was worthwhile for the customers you were targeting?
- Reversed placement of that in "...if it was that..." and added a what. Flows a bit more naturally.
- Instead of "too much hesitations", you probably want either "too many hesitations" or "too much hesitation". It depends on if there was more than one hesitation - if so, go with "too many".
- I'm having trouble parsing "Investors should either help in either ways". Are the ways meant to be exclusive? Or going for how they had multiple ways to help? 
- renown to well-known. Renown doesn't quite seem to fit - I think it might be a tense issue (renown vs renowned, known now vs known for some time)
- ancien to ancient
- removed have before continued trusting to put it in past tense
- sustain feels a bit off. Maybe "be sustained", or "survive".
- In the bitabout sending a report, I swapped it all to past tense (and not just the first line)