Update adam_adamax.md

Author: pkofod

docs/src/algo/adam_adamax.md

@@ -1,5 +1,5 @@
 # Adam and AdaMax
-This page contains information about Adam and AdaMax.
+This page contains information about Adam and AdaMax. Notice, that these algorithms do not use line search algorithms, so some tuning of `alpha` may be necessary to obtain sufficiently fast convergence on your specific problem.
 ## Constructors
 ```julia
 Adam(;  alpha=0.0001,
@@ -19,4 +19,4 @@ AdaMax(; alpha=0.002,
 where `alpha` is the step length or learning parameter. `beta_mean` and `beta_var` are exponential decay parameters for the first and second moments estimates. Setting these closer to 0 will cause past iterates to matter less for the current steps and setting them closer to 1 means emphasizing past iterates more.
 
 ## References
-Kingma, Diederik P., and Jimmy Ba. "Adam: A method for stochastic optimization." arXiv preprint arXiv:1412.6980 (2014).
+Kingma, Diederik P., and Jimmy Ba. "Adam: A method for stochastic optimization." arXiv preprint arXiv:1412.6980 (2014).