pamtoxvmini, pbmtoybm, pnmtoxwd, xvminitoppm, xwdtopnm, ybmtopbm: add pages (#11406)

pages/common/xwdtopnm.md

@@ -0,0 +1,16 @@
+# xwdtopnm
+
+> Convert an X11 or X10 window dump file to PNM.
+> More information: <https://netpbm.sourceforge.net/doc/xwdtopnm.html>.
+
+- Convert a XWD image file to PBM:
+
+`xwdtopnm {{path/to/input_file.xwd}} > {{path/to/output_file.pnm}}`
+
+- Display information about the conversion process:
+
+`xwdtopnm -verbose {{path/to/input_file.xwd}} > {{path/to/output_file.pnm}}`
+
+- Display the contents of the X11 header of the input file:
+
+`xwdtopnm -headerdump {{path/to/input_file.xwd}} > {{path/to/output_file.pnm}}`