Fix formatting and clarify import statement

Author: sshin23

docs/src/guide.jl

@@ -16,7 +16,7 @@
 # - Step 4 (interchangable with Step 2): create constraints with [`constraint`](@ref), while attaching it to previously created `ExaCore`.
 # - Step 5: create an [`ExaModel`](@ref) based on the `ExaCore`.
 
-# Now, let's jump right in. We import ExaModels via (Step 0):
+# Now, let's jump right in. We import ExaModels via (Step 0): 
 using ExaModels
 # Now, all the functions that are necessary for creating model are imported to into `Main`.