Seperate TCP options and update feature documentation

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (c33f1b8) 99.31% compared to head (fd42d36) 99.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #65 +/- ## ======================================== Coverage 99.31% 99.32% ======================================== Files 141 142 +1 Lines 34881 35218 +337 ======================================== + Hits 34643 34981 +338 + Misses 238 237 -1 ``` | [Impacted Files](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | Coverage Δ | | |---|---|---| | [etherparse/src/err/ip/header\_write\_error.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwL2hlYWRlcl93cml0ZV9lcnJvci5ycw==) | `100.00% <ø> (ø)` | | | [etherparse/src/err/ip\_auth/icv\_len\_error.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwX2F1dGgvaWN2X2xlbl9lcnJvci5ycw==) | `100.00% <ø> (ø)` | | | [etherparse/src/err/ipv4/bad\_options\_len.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwdjQvYmFkX29wdGlvbnNfbGVuLnJz) | `100.00% <ø> (ø)` | | | [etherparse/src/err/ipv4\_exts/header\_write\_error.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwdjRfZXh0cy9oZWFkZXJfd3JpdGVfZXJyb3IucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/err/ipv6\_exts/exts\_walk\_error.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwdjZfZXh0cy9leHRzX3dhbGtfZXJyb3IucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/err/ipv6\_exts/header\_write\_error.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2lwdjZfZXh0cy9oZWFkZXJfd3JpdGVfZXJyb3IucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/err/value\_type.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL3ZhbHVlX3R5cGUucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/internet/ip\_number\_impl.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvaW50ZXJuZXQvaXBfbnVtYmVyX2ltcGwucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/internet/ipv4\_dscp.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvaW50ZXJuZXQvaXB2NF9kc2NwLnJz) | `100.00% <ø> (ø)` | | | [etherparse/src/internet/ipv4\_ecn.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvaW50ZXJuZXQvaXB2NF9lY24ucnM=) | `100.00% <ø> (ø)` | | | ... and [11 more](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/65/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid)

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