doc: issue-3530 assert.markdown updated

[birnam]

Documentation for assert describes:

assert(value[, message]), assert.ok(value[, message]) Tests if value is truthy. It is equivalent to assert.equal(true, !!value, message). 

But assert.equal parameters are actual value first, then expected value. The documentation should read:

assert(value[, message]), assert.ok(value[, message])# Tests if value is truthy. It is equivalent to assert.equal(!!value, true, message). 

[Fishrock123]

@birnam could you prefix the commit message with doc: and make sure it is no longer than 50 characters?

[birnam]

commit is updated @Fishrock123

[evanlucas]

LGTM

[thefourtheye]

LGTM

[jasnell]

Landed in 471aa5a

[MylesBorins]

landed in lts-v4.x-staging as dfc2707