Group language manuals into function and keyword directories

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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diff --git a/doc/language/function/cpsc-function-num_to_str.7.md b/doc/language/function/cpsc-function-num_to_str.7.md
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+% CPSC-FUNCTION-NUM_TO_STR(7)
+
+# NAME
+
+cpsc-function-num_to_str - convert a number to text
+
+# SYNOPSIS
+
+```text
+NUM_TO_STR(number : INTEGER or REAL) RETURNS STRING
+```
+
+# DESCRIPTION
+
+Format INTEGER as signed decimal text and REAL with six digits after the
+decimal point.
+
+# EXAMPLE
+
+```text
+OUTPUT NUM_TO_STR(42), " ", NUM_TO_STR(3.5)
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](../cpsc-language-overview.7.md), [cpsc-function-str_to_num(7)](cpsc-function-str_to_num.7.md).
+