move docs for nth-root, fix docs for minmax

basis/math/functions/functions-docs.factor

@@ -54,6 +54,8 @@ ARTICLE: "power-functions" "Powers and logarithms"
 { $subsections log1+ log10 }
 "Raising a number to a power:"
 { $subsections ^ 10^ }
+"Finding the root of a number:"
+{ $subsections nth-root }
 "Converting between rectangular and polar form:"
 { $subsections
     abs
@@ -259,6 +261,10 @@ HELP: ^
 { $description "Raises " { $snippet "x" } " to the power of " { $snippet "y" } ". If " { $snippet "y" } " is an integer the answer is computed exactly, otherwise a floating point approximation is used." }
 { $errors "Throws an error if " { $snippet "x" } " and " { $snippet "y" } " are both integer 0." } ;
 
+HELP: nth-root
+{ $values { "n" integer } { "x" number } { "y" number } }
+{ $description "Calculates the nth root of a number, such that " { $snippet "y^n=x" } "." } ;
+
 HELP: 10^
 { $values { "x" number } { "y" number } }
 { $description "Raises " { $snippet "x" } " to the power of 10. If " { $snippet "x" } " is an integer the answer is computed exactly, otherwise a floating point approximation is used." } ;

basis/math/statistics/statistics-docs.factor

@@ -4,7 +4,7 @@ IN: math.statistics
 
 HELP: geometric-mean
 { $values { "seq" sequence } { "x" "a non-negative real number"} }
-{ $description "Computes the geometric mean of all elements in " { $snippet "seq" } ". The geometric mean measures the central tendency of a data set that minimizes the effects of extreme values." }
+{ $description "Computes the geometric mean of all elements in " { $snippet "seq" } ". The geometric mean measures the central tendency of a data set and minimizes the effects of extreme values." }
 { $examples { $example "USING: math.statistics prettyprint ;" "{ 1 2 3 } geometric-mean ." "1.81712059283214" } }
 { $errors "Throws a " { $link signal-error. } " (square-root of 0) if the sequence is empty." } ;
 
@@ -44,10 +44,6 @@ HELP: minmax
         "{ 1 2 3 } minmax 2array ."
         "{ 1 3 }"
     }
-    { $example "USING: arrays math.statistics prettyprint ;"
-        "{ 1 2 3 4 } minmax 2array ."
-        "{ 1 4 }"
-    }
 } ;
 
 HELP: std

extra/math/analysis/analysis-docs.factor

@@ -9,10 +9,6 @@ HELP: gammaln
 { $values { "x" number } { "gamma[x]" number } }
 { $description "An alternative to " { $link gamma } " when gamma(x)'s range varies too widely." } ;
 
-HELP: nth-root
-{ $values { "n" integer } { "x" number } { "y" number } }
-{ $description "Calculates the nth root of a number, such that " { $snippet "y^n=x" } "." } ;
-
 HELP: exp-int
 { $values { "x" number } { "y" number } }
 { $description "Exponential integral function." }