Consistency is important. We should use always contractions or not.

IMO I prefer to not use contraction for symfony-docs. Are you agree with this ?

I can make PR for each group (avoiding huge review)

am

I found 0 occurences ofI'm
I found 1 occurences ofI am

are

I found 254 occurences ofyou're
I found 162 occurences ofyou are

I found 1 occurences ofwe’re
I found 20 occurences ofwe are

I found 0 occurences ofthey’re
I found 135 occurences ofthey are

is

I found 367 occurences ofit's
I found 301 occurences ofit is

have

I found 59 occurences ofyou've
I found 250 occurences ofyou have

I found 4 occurences ofwe've
I found 20 occurences ofwe have

I found 0 occurences ofthey've
I found 11 occurences ofthey have

will

I found 97 occurences ofyou'll
I found 250 occurences ofyou will

I found 9 occurences ofit'll
I found 121 occurences ofit will

I found 9 occurences ofwe'll
I found 6 occurences ofwe will

I found 2 occurences ofthey'll
I found 17 occurences ofthey will

would

I found 16 occurences ofyou'd
I found 31 occurences ofyou would

I found 0 occurences ofit'd
I found 19 occurences ofit would

I found 0 occurences ofwe'd
I found 2 occurences ofwe would

I found 0 occurences ofthey'd
I found 2 occurences ofthey would