More docs: string copying.

docs/strings/strzcpy.ms

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+.DA
+
+.TL
+strzcpy
+
+.AU
+Wael Karram
+
+.AB no
+Documentation for strzcpy
+.AE
+
+.ND
+
+.PP
+The header and implementation file both define a safe string copying function.
+.br
+This function takes three arguments: 
+.I "char *restrict dst" ,
+.I "const char *restrict src" \0and
+.I "size_t len" ,
+the first of which is the destination buffer (should have enough space), the second a source buffer,
+and the third a maximal length to copy.
+.br
+Will always produce a null-terminated string copy.