fix MAX_EXP docs

Author: RalfJung

library/core/src/num/f128.rs

@@ -200,7 +200,7 @@ impl f128 {
     /// ≥&nbsp;0.5&nbsp;×&nbsp;2<sup><i>x</i></sup>.
     #[unstable(feature = "f128", issue = "116909")]
     pub const MIN_EXP: i32 = -16_381;
-    /// Maximum possible power of 2 exponent.
+    /// One greater than the maximum possible power of 2 exponent.
     ///
     /// If <i>x</i>&nbsp;=&nbsp;`MAX_EXP`, then normal numbers
     /// &lt;&nbsp;1&nbsp;×&nbsp;2<sup><i>x</i></sup>.

library/core/src/num/f16.rs

@@ -195,7 +195,7 @@ impl f16 {
     /// ≥&nbsp;0.5&nbsp;×&nbsp;2<sup><i>x</i></sup>.
     #[unstable(feature = "f16", issue = "116909")]
     pub const MIN_EXP: i32 = -13;
-    /// Maximum possible power of 2 exponent.
+    /// One greater than the maximum possible power of 2 exponent.
     ///
     /// If <i>x</i>&nbsp;=&nbsp;`MAX_EXP`, then normal numbers
     /// &lt;&nbsp;1&nbsp;×&nbsp;2<sup><i>x</i></sup>.

library/core/src/num/f32.rs

@@ -446,7 +446,7 @@ impl f32 {
     /// ≥&nbsp;0.5&nbsp;×&nbsp;2<sup><i>x</i></sup>.
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const MIN_EXP: i32 = -125;
-    /// Maximum possible power of 2 exponent.
+    /// One greater than the maximum possible power of 2 exponent.
     ///
     /// If <i>x</i>&nbsp;=&nbsp;`MAX_EXP`, then normal numbers
     /// &lt;&nbsp;1&nbsp;×&nbsp;2<sup><i>x</i></sup>.

library/core/src/num/f64.rs

@@ -445,7 +445,7 @@ impl f64 {
     /// ≥&nbsp;0.5&nbsp;×&nbsp;2<sup><i>x</i></sup>.
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const MIN_EXP: i32 = -1021;
-    /// Maximum possible power of 2 exponent.
+    /// One greater than the maximum possible power of 2 exponent.
     ///
     /// If <i>x</i>&nbsp;=&nbsp;`MAX_EXP`, then normal numbers
     /// &lt;&nbsp;1&nbsp;×&nbsp;2<sup><i>x</i></sup>.