fix([README.md]): typos in README.md causes installation error

[rexlim820220]

Summary

The following description in README.md might causes ambiguous parsing during cmake code building:

cmake -DLWS_WITHOUT_TESTAPPS=ON -DLWS_WITHOUT_TEST_SERVER=ON-DLWS_WITHOUT_TEST_SERVER_EXTPOLL=ON.

What is the behavior?

While copying above commands to Dockerfile, error was encountered.

The code is built in Docker under CentOS Linux release 7.7.1908 (Core) with cmake version 3.6.2.

Dockerfile:3
--------------------
   2 |     ADD cbrs /opt/app
  17 | >>>     RUN cd /opt/app/ && \
  18 | >>>     # Install pre-requisites
  19 | >>>     yum install -y openssl-devel libcurl-devel uncrustify && \
  20 | >>>     # Build pre-requisite: libwebsockets
  21 | >>>     git clone https://libwebsockets.org/repo/libwebsockets --depth 1 --branch v4.2-stable && \
  22 | >>>     cd libwebsockets && mkdir build && cd build && \
  23 | >>>     cmake -DLWS_WITHOUT_TESTAPPS=ON -DLWS_WITHOUT_TEST_SERVER=ON-DLWS_WITHOUT_TEST_SERVER_EXTPOLL=ON \
  24 | >>>        -DLWS_WITHOUT_TEST_PING=ON -DLWS_WITHOUT_TEST_CLIENT=ON -DCMAKE_C_FLAGS="-fpic" -DCMAKE_INSTALL_PREFIX=/usr/local ..
--------------------
ERROR: failed to solve: process "/bin/sh -c cd /opt/app/ &&     yum install -y libssl-dev libcurl4-openssl-dev uncrustify &&     git clone https://libwebsockets.org/repo/libwebsockets --depth 1 --branch v4.2-stable &&     cd libwebsockets && mkdir build && cd build &&     cmake -DLWS_WITHOUT_TESTAPPS=ON        -DLWS_WITHOUT_TEST_SERVER=ON-DLWS_WITHOUT_TEST_SERVER_EXTPOLL=ON        -DLWS_WITHOUT_TEST_PING=ON        -DLWS_WITHOUT_TEST_CLIENT=ON        -DCMAKE_C_FLAGS=\"-fpic\" .." did not complete successfully: exit code: 1
ERROR: Service 'app' failed to build

Advise

A maybe nicer description would be splitting -D from SERVER=ON, which makes the command less ambiguous.

/label ~bug ~reproduced ~needs-investigation

[linux-foundation-easycla]

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• ✅ login: rexlim820220 / name: Pisces Zhang (2ab0573)

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[ityuhui]

Thank you @rexlim820220

Can you please follow the guidelines to sign CLA ?

[rexlim820220]

＠ity

Thank you @rexlim820220

Can you please follow the guidelines to sign CLA ?

will be spending time figuring it out, thanks

[ityuhui]

/lgtm
/approve

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