Correct perf db filename in documentation (#2343)

* fix perf db filename and cmake prefix path note addition * reword perf db location
ROCm · Jan 6, 2020 · 8ef1e14 · 8ef1e14
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diff --git a/README.md b/README.md
@@ -99,6 +99,8 @@ An example cmake step can be:
 CXX=/opt/rocm/hcc/bin/hcc cmake -DMIOPEN_BACKEND=HIP -DCMAKE_PREFIX_PATH="/opt/rocm/hcc;/opt/rocm/hip" ..
 ```
 
+Note: When specifying the path for the `CMAKE_PREFIX_PATH` variable, do not use the `~` shorthand for the user home directory.
+
 ### Setting Up Locations
 
 By default the install location is set to '/opt/rocm', this can be set by using `CMAKE_INSTALL_PREFIX`:

diff --git a/doc/src/perfdatabase.md b/doc/src/perfdatabase.md
@@ -78,4 +78,4 @@ This variable allows for limiting the scope of `MIOPEN_FIND_ENFORCE`, so that on
 
 ### Updating MIOpen and the User Db
 
-It is important to note that if the user installs a new version of MIOpen, it is recommended that the user move, or delete their old user performance database file. This will prevent older database entries from polution the configurations shipped with the newer system database. The user can find the file with the suffix `*.updb.txt` in the user perf db path.
+It is important to note that if the user installs a new version of MIOpen, it is recommended that the user move, or delete their old user performance database file. This will prevent older database entries from poluting the configurations shipped with the newer system database. The user perf db is named `miopen.udb` and is located at the user perf db path.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -78,4 +78,4 @@ This variable allows for limiting the scope of `MIOPEN_FIND_ENFORCE`, so that on

		### Updating MIOpen and the User Db

		It is important to note that if the user installs a new version of MIOpen, it is recommended that the user move, or delete their old user performance database file. This will prevent older database entries from polution the configurations shipped with the newer system database. The user can find the file with the suffix `*.updb.txt` in the user perf db path.
		It is important to note that if the user installs a new version of MIOpen, it is recommended that the user move, or delete their old user performance database file. This will prevent older database entries from poluting the configurations shipped with the newer system database. The user perf db is named `miopen.udb` and is located at the user perf db path.