popd: add page (#1517)

pages/linux/popd.md

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+# popd
+
+> Remove a directory placed on the directory stack by the `pushd` command.
+
+- Remove the top directory from the stack and cd to it:
+
+`popd`
+
+- Remove the Nth directory (starting from zero to the left from the list printed with `dirs`):
+
+`popd +N`
+
+- Remove the Nth directory (starting from zero to the right from the list printed with `dirs`):
+
+`popd -N`

pages/osx/popd.md

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+# popd
+
+> Remove a directory placed on the directory stack via the pushd shell built-in.
+
+- Remove the top directory from the stack and cd to it:
+
+`popd`
+
+- Remove the Nth directory (starting from zero to the left from the list printed with `dirs`):
+
+`popd +N`
+
+- Remove the Nth directory (starting from zero to the right from the list printed with `dirs`):
+
+`popd -N`

pages/windows/popd.md

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+# popd
+
+> Changes the current directory to the directory stored by the `pushd` command.
+
+- Switch to directory at the top of the stack:
+
+`popd`