Merge pull request #17 from vks/fix-predictability-statements

Fix predictability statements

Author: dhardy

src/guide-rngs.md

@@ -42,10 +42,10 @@ You may wish to refer to the [pcg-random] and [xoshiro] websites.
 |------|-----------|-------------|--------|---------|--------|----------|
 | [`SmallRng`] | (unspecified) | 7 GB/s | 16 bytes | ★★★☆☆ | ≥ `u32` * 2<sup>64</sup> | not portable |
 | [`Pcg32`] | PCG XSH RR 64/32 (LCG) | 3 GB/s | 16 bytes | ★★★☆☆ | `u32` * 2<sup>64</sup> | — |
-| [`Pcg64`] | PCG XSL 128/64 (LCG) | 4 GB/s | 32 bytes | ★★★★☆ | `u64` * 2<sup>128</sup> | — |
+| [`Pcg64`] | PCG XSL 128/64 (LCG) | 4 GB/s | 32 bytes | ★★★☆☆ | `u64` * 2<sup>128</sup> | — |
 | [`Pcg64Mcg`] | PCG XSL 128/64 (MCG) | 7 GB/s | 16 bytes | ★★★☆☆ | `u64` * 2<sup>126</sup> | — |
 | [`XorShiftRng`] | Xorshift 32/128 | 5 GB/s | 16 bytes | ★☆☆☆☆ | `u32` * 2<sup>128</sup> - 1 | — |
-| [`Xoshiro256StarStar`] | Xoshiro256\*\* | 7 GB/s | 32 bytes | ★★★☆☆ | `u64` * 2<sup>256</sup> - 1 | jump-ahead |
+| [`Xoshiro256PlusPlus`] | Xoshiro256++ | 7 GB/s | 32 bytes | ★★★☆☆ | `u64` * 2<sup>256</sup> - 1 | jump-ahead |
 | [`Xoshiro256Plus`] | Xoshiro256+ | 8 GB/s | 32 bytes | ★★☆☆☆ | `u64` * 2<sup>256</sup> - 1 | jump-ahead |
 | [`SplitMix64`] | splitmix64 | 8 GB/s | 8 bytes | ★☆☆☆☆ | `u64` * 2<sup>64</sup> | — |
 | [`StepRng`] | counter | 51 GB/s | 16 bytes | ☆☆☆☆☆ | `u64` * 2<sup>64</sup> | — |
@@ -58,8 +58,6 @@ based on theory and observable defects, roughly as follows:
 -   ★☆☆☆☆ = suitable for simple applications but with significant flaws
 -   ★★☆☆☆ = good performance in most tests, some issues
 -   ★★★☆☆ = good performance and theory, no major issues
--   ★★★★☆ = no observable issues and not trivial to predict (but not
-    recommended for security)
 -   ★★★★★ = cryptographic quality
 
 ## Cryptographically secure pseudo-random number generators (CSPRNGs)
@@ -306,7 +304,7 @@ http://random.mat.sbg.ac.at/results/peter/A19final.pdf) by P. Hellekalek.
 [`Pcg64`]: ../rand/rand_pcg/type.Pcg64.html
 [`Pcg64Mcg`]: ../rand/rand_pcg/type.Pcg64Mcg.html
 [`XorShiftRng`]: ../rand/rand_xorshift/struct.XorShiftRng.html
-[`Xoshiro256StarStar`]: ../rand/rand_xoshiro/struct.Xoshiro256StarStar.html
+[`Xoshiro256PlusPlus`]: ../rand/rand_xoshiro/struct.Xoshiro256PlusPlus.html
 [`Xoshiro256Plus`]: ../rand/rand_xoshiro/struct.Xoshiro256Plus.html
 [`SplitMix64`]: ../rand/rand_xoshiro/struct.SplitMix64.html
 [`ChaChaRng`]: ../rand/rand_chacha/struct.ChaChaRng.html