Fix license files (open-telemetry#1217)

Author: chalin

LICENSE

@@ -1,221 +1,7 @@
-Except as otherwise noted, the content of this repository is licensed under the
-Creative Commons Attribution 4.0 License [1] for documentation, and under the
-Apache License Version 2.0 [2] for code, including code excerpts.
-
-Copyright 2015-present OpenTelemetry authors. All rights reserved.
-
-[1]: https://creativecommons.org/licenses/by/4.0 (for a copy, see below)
-[2]: https://apache.org/licenses/LICENSE-2.0
-
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-
 Creative Commons Attribution 4.0 International
 
+https://creativecommons.org/licenses/by/4.0
+
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 Creative Commons Corporation ("Creative Commons") is not a law firm and
@@ -249,7 +35,7 @@ exhaustive, and do not form part of our licenses.
      material not subject to the license. This includes other CC-
      licensed material, or material used under an exception or
      limitation to copyright. More considerations for licensors:
-     wiki.creativecommons.org/Considerations_for_licensors
+    wiki.creativecommons.org/Considerations_for_licensors
 
      Considerations for the public: By using one of our public
      licenses, a licensor grants the public permission to use the
@@ -266,7 +52,7 @@ exhaustive, and do not form part of our licenses.
      Although not required by our licenses, you are encouraged to
      respect those requests where reasonable. More considerations
      for the public:
-     wiki.creativecommons.org/Considerations_for_licensees
+    wiki.creativecommons.org/Considerations_for_licensees
 
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@@ -591,21 +377,22 @@ Section 8 -- Interpretation.
 
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