fs(3lua): init man pages

Initialise man pages for the fs module.

man/fs/fs.move.3lua.scd

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+FS.MOVE(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*fs.move* - move a file
+
+# SYNOPSIS
+*fs.move*(_src_: *string*, _dst_: *string*)
+
+# DESCRIPTION
+*fs.move* moves the file _src_ to the path _dst_,
+overwriting _dst_ if it exists.
+Both _src_ and _dst_ must be of the same type
+(that is, both directories or both non-directories)
+and must reside on the same file system.
+
+If you need to move files across different file systems,
+consider using fs.copy(3lua) instead.
+
+If an error occurs,
+*fs.move* returns nil, an error message and
+a platform-dependent error code.
+There are many reasons *fs.move* can fail;
+see rename(2) for a list of possible error values.
+
+# EXAMPLES
+Rename the file _tel_ to _tel1_:
+
+	fs.move("tel", "tel1")
+
+# SEE ALSO
+callisto(3lua), fs(3lua), fs.copy(3lua), rename(2)