Update docs

Author: OlivierHnt

docs/src/interfaces/arblib.md

@@ -13,7 +13,7 @@ Some of the things that Arblib excels at are:
 Some of the things that IntervalArithmetic excels at are:
 1. Fast computations at `Float32` and `Float64` precision.
 2. Computations with wide intervals (FLINT is in general not optimized for this, though the situation is improving).
-3. Built-in safety features, such as decorations (see [Decorations](@ref)) and the "NG" flag (see [Guarantee](@ref)).
+3. Built-in safety features, such as decorations (see [Decorations](@ref)) and the "NG" flag (see ["NG" label](@ref)).
 
 
 

docs/src/manual/usage.md

@@ -14,9 +14,9 @@ There are several useful output representations for intervals. The display is co
 
     - `:midpoint`: output in the midpoint-radius form, e.g. `1.2 ± 0.100001`.
 
-- `sigdigits :: Int` keyword argument: number of significant figures to show in standard mode.
+- `sigdigits :: Int` keyword argument: number of significant digits to show in standard mode.
 
-- `decorations :: Bool` keyword argument: whether to show [decorations](decorations.md) or not.
+- `decorations :: Bool` keyword argument: whether to show decorations or not.
 
 ```@repl
 using IntervalArithmetic